1 /*
2 * linux/drivers/char/synclink_cs.c
3 *
4 * $Id: synclink_cs.c,v 3.10 2003/09/05 14:04:26 paulkf Exp $
5 *
6 * Device driver for Microgate SyncLink PC Card
7 * multiprotocol serial adapter.
8 *
9 * written by Paul Fulghum for Microgate Corporation
10 * paulkf@microgate.com
11 *
12 * Microgate and SyncLink are trademarks of Microgate Corporation
13 *
14 * This code is released under the GNU General Public License (GPL)
15 *
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
30 #if defined(__i386__)
31 # define BREAKPOINT() asm(" int $3");
32 #else
33 # define BREAKPOINT() { }
34 #endif
35
36 #define MAX_DEVICE_COUNT 4
37
38 #include <linux/config.h>
39 #include <linux/module.h>
40 #include <linux/version.h>
41 #include <linux/errno.h>
42 #include <linux/signal.h>
43 #include <linux/sched.h>
44 #include <linux/timer.h>
45 #include <linux/interrupt.h>
46 #include <linux/pci.h>
47 #include <linux/tty.h>
48 #include <linux/tty_flip.h>
49 #include <linux/serial.h>
50 #include <linux/major.h>
51 #include <linux/string.h>
52 #include <linux/fcntl.h>
53 #include <linux/ptrace.h>
54 #include <linux/ioport.h>
55 #include <linux/mm.h>
56 #include <linux/slab.h>
57 #include <linux/netdevice.h>
58 #include <linux/vmalloc.h>
59 #include <linux/init.h>
60 #include <asm/serial.h>
61 #include <linux/delay.h>
62 #include <linux/ioctl.h>
63
64 #include <asm/system.h>
65 #include <asm/io.h>
66 #include <asm/irq.h>
67 #include <asm/dma.h>
68 #include <asm/bitops.h>
69 #include <asm/types.h>
70 #include <linux/termios.h>
71 #include <linux/tqueue.h>
72
73 #include <pcmcia/version.h>
74 #include <pcmcia/cs_types.h>
75 #include <pcmcia/cs.h>
76 #include <pcmcia/cistpl.h>
77 #include <pcmcia/cisreg.h>
78 #include <pcmcia/ds.h>
79 #include <pcmcia/bus_ops.h>
80
81 #ifdef CONFIG_SYNCLINK_SYNCPPP_MODULE
82 #define CONFIG_SYNCLINK_SYNCPPP 1
83 #endif
84
85 #ifdef CONFIG_SYNCLINK_SYNCPPP
86 #if LINUX_VERSION_CODE < VERSION(2,4,3)
87 #include "../net/wan/syncppp.h"
88 #else
89 #include <net/syncppp.h>
90 #endif
91 #endif
92
93 #include <asm/segment.h>
94 #define GET_USER(error,value,addr) error = get_user(value,addr)
95 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
96 #define PUT_USER(error,value,addr) error = put_user(value,addr)
97 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
98
99 #include <asm/uaccess.h>
100
101 #include "linux/synclink.h"
102
103 static MGSL_PARAMS default_params = {
104 MGSL_MODE_HDLC, /* unsigned long mode */
105 0, /* unsigned char loopback; */
106 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
107 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
108 0, /* unsigned long clock_speed; */
109 0xff, /* unsigned char addr_filter; */
110 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
111 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
112 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
113 9600, /* unsigned long data_rate; */
114 8, /* unsigned char data_bits; */
115 1, /* unsigned char stop_bits; */
116 ASYNC_PARITY_NONE /* unsigned char parity; */
117 };
118
119 typedef struct
120 {
121 int count;
122 unsigned char status;
123 char data[1];
124 } RXBUF;
125
126 /* The queue of BH actions to be performed */
127
128 #define BH_RECEIVE 1
129 #define BH_TRANSMIT 2
130 #define BH_STATUS 4
131
132 #define IO_PIN_SHUTDOWN_LIMIT 100
133
134 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
135
136 struct _input_signal_events {
137 int ri_up;
138 int ri_down;
139 int dsr_up;
140 int dsr_down;
141 int dcd_up;
142 int dcd_down;
143 int cts_up;
144 int cts_down;
145 };
146
147
148 /*
149 * Device instance data structure
150 */
151
152 typedef struct _mgslpc_info {
153 void *if_ptr; /* General purpose pointer (used by SPPP) */
154 int magic;
155 int flags;
156 int count; /* count of opens */
157 int line;
158 unsigned short close_delay;
159 unsigned short closing_wait; /* time to wait before closing */
160
161 struct mgsl_icount icount;
162
163 struct termios normal_termios;
164 struct termios callout_termios;
165
166 struct tty_struct *tty;
167 int timeout;
168 int x_char; /* xon/xoff character */
169 int blocked_open; /* # of blocked opens */
170 long session; /* Session of opening process */
171 long pgrp; /* pgrp of opening process */
172 unsigned char read_status_mask;
173 unsigned char ignore_status_mask;
174
175 unsigned char *tx_buf;
176 int tx_put;
177 int tx_get;
178 int tx_count;
179
180 /* circular list of fixed length rx buffers */
181
182 unsigned char *rx_buf; /* memory allocated for all rx buffers */
183 int rx_buf_total_size; /* size of memory allocated for rx buffers */
184 int rx_put; /* index of next empty rx buffer */
185 int rx_get; /* index of next full rx buffer */
186 int rx_buf_size; /* size in bytes of single rx buffer */
187 int rx_buf_count; /* total number of rx buffers */
188 int rx_frame_count; /* number of full rx buffers */
189
190 wait_queue_head_t open_wait;
191 wait_queue_head_t close_wait;
192
193 wait_queue_head_t status_event_wait_q;
194 wait_queue_head_t event_wait_q;
195 struct timer_list tx_timer; /* HDLC transmit timeout timer */
196 struct _mgslpc_info *next_device; /* device list link */
197
198 unsigned short imra_value;
199 unsigned short imrb_value;
200 unsigned char pim_value;
201
202 spinlock_t lock;
203 struct tq_struct task; /* task structure for scheduling bh */
204
205 u32 max_frame_size;
206
207 u32 pending_bh;
208
209 int bh_running;
210 int bh_requested;
211
212 int dcd_chkcount; /* check counts to prevent */
213 int cts_chkcount; /* too many IRQs if a signal */
214 int dsr_chkcount; /* is floating */
215 int ri_chkcount;
216
217 int rx_enabled;
218 int rx_overflow;
219
220 int tx_enabled;
221 int tx_active;
222 int tx_aborting;
223 u32 idle_mode;
224
225 int if_mode; /* serial interface selection (RS-232, v.35 etc) */
226
227 char device_name[25]; /* device instance name */
228
229 unsigned int io_base; /* base I/O address of adapter */
230 unsigned int irq_level;
231
232 MGSL_PARAMS params; /* communications parameters */
233
234 unsigned char serial_signals; /* current serial signal states */
235
236 char irq_occurred; /* for diagnostics use */
237 char testing_irq;
238 unsigned int init_error; /* startup error (DIAGS) */
239
240 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
241 BOOLEAN drop_rts_on_tx_done;
242
243 struct _input_signal_events input_signal_events;
244
245 /* PCMCIA support */
246 dev_link_t link;
247 dev_node_t node;
248 int stop;
249 struct bus_operations *bus;
250
251 /* SPPP/Cisco HDLC device parts */
252 int netcount;
253 int dosyncppp;
254 spinlock_t netlock;
255 #ifdef CONFIG_SYNCLINK_SYNCPPP
256 struct ppp_device pppdev;
257 char netname[10];
258 struct net_device *netdev;
259 struct net_device_stats netstats;
260 struct net_device netdevice;
261 #endif
262 } MGSLPC_INFO;
263
264 #define MGSLPC_MAGIC 0x5402
265
266 /*
267 * The size of the serial xmit buffer is 1 page, or 4096 bytes
268 */
269 #define TXBUFSIZE 4096
270
271
272 #define CHA 0x00 /* channel A offset */
273 #define CHB 0x40 /* channel B offset */
274
275 #define RXFIFO 0
276 #define TXFIFO 0
277 #define STAR 0x20
278 #define CMDR 0x20
279 #define RSTA 0x21
280 #define PRE 0x21
281 #define MODE 0x22
282 #define TIMR 0x23
283 #define XAD1 0x24
284 #define XAD2 0x25
285 #define RAH1 0x26
286 #define RAH2 0x27
287 #define DAFO 0x27
288 #define RAL1 0x28
289 #define RFC 0x28
290 #define RHCR 0x29
291 #define RAL2 0x29
292 #define RBCL 0x2a
293 #define XBCL 0x2a
294 #define RBCH 0x2b
295 #define XBCH 0x2b
296 #define CCR0 0x2c
297 #define CCR1 0x2d
298 #define CCR2 0x2e
299 #define CCR3 0x2f
300 #define VSTR 0x34
301 #define BGR 0x34
302 #define RLCR 0x35
303 #define AML 0x36
304 #define AMH 0x37
305 #define GIS 0x38
306 #define IVA 0x38
307 #define IPC 0x39
308 #define ISR 0x3a
309 #define IMR 0x3a
310 #define PVR 0x3c
311 #define PIS 0x3d
312 #define PIM 0x3d
313 #define PCR 0x3e
314 #define CCR4 0x3f
315
316 // IMR/ISR
317
318 #define IRQ_BREAK_ON BIT15 // rx break detected
319 #define IRQ_DATAOVERRUN BIT14 // receive data overflow
320 #define IRQ_ALLSENT BIT13 // all sent
321 #define IRQ_UNDERRUN BIT12 // transmit data underrun
322 #define IRQ_TIMER BIT11 // timer interrupt
323 #define IRQ_CTS BIT10 // CTS status change
324 #define IRQ_TXREPEAT BIT9 // tx message repeat
325 #define IRQ_TXFIFO BIT8 // transmit pool ready
326 #define IRQ_RXEOM BIT7 // receive message end
327 #define IRQ_EXITHUNT BIT6 // receive frame start
328 #define IRQ_RXTIME BIT6 // rx char timeout
329 #define IRQ_DCD BIT2 // carrier detect status change
330 #define IRQ_OVERRUN BIT1 // receive frame overflow
331 #define IRQ_RXFIFO BIT0 // receive pool full
332
333 // STAR
334
335 #define XFW BIT6 // transmit FIFO write enable
336 #define CEC BIT2 // command executing
337 #define CTS BIT1 // CTS state
338
339 #define PVR_DTR BIT0
340 #define PVR_DSR BIT1
341 #define PVR_RI BIT2
342 #define PVR_AUTOCTS BIT3
343 #define PVR_RS232 0x20 /* 0010b */
344 #define PVR_V35 0xe0 /* 1110b */
345 #define PVR_RS422 0x40 /* 0100b */
346
347 /* Register access functions */
348
349 #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
350 #define read_reg(info, reg) inb((info)->io_base + (reg))
351
352 #define read_reg16(info, reg) inw((info)->io_base + (reg))
353 #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
354
355 #define set_reg_bits(info, reg, mask) \
356 write_reg(info, (reg), \
357 (unsigned char) (read_reg(info, (reg)) | (mask)))
358 #define clear_reg_bits(info, reg, mask) \
359 write_reg(info, (reg), \
360 (unsigned char) (read_reg(info, (reg)) & ~(mask)))
361 /*
362 * interrupt enable/disable routines
363 */
irq_disable(MGSLPC_INFO * info,unsigned char channel,unsigned short mask)364 static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
365 {
366 if (channel == CHA) {
367 info->imra_value |= mask;
368 write_reg16(info, CHA + IMR, info->imra_value);
369 } else {
370 info->imrb_value |= mask;
371 write_reg16(info, CHB + IMR, info->imrb_value);
372 }
373 }
irq_enable(MGSLPC_INFO * info,unsigned char channel,unsigned short mask)374 static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
375 {
376 if (channel == CHA) {
377 info->imra_value &= ~mask;
378 write_reg16(info, CHA + IMR, info->imra_value);
379 } else {
380 info->imrb_value &= ~mask;
381 write_reg16(info, CHB + IMR, info->imrb_value);
382 }
383 }
384
385 #define port_irq_disable(info, mask) \
386 { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
387
388 #define port_irq_enable(info, mask) \
389 { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
390
391 static void rx_start(MGSLPC_INFO *info);
392 static void rx_stop(MGSLPC_INFO *info);
393
394 static void tx_start(MGSLPC_INFO *info);
395 static void tx_stop(MGSLPC_INFO *info);
396 static void tx_set_idle(MGSLPC_INFO *info);
397
398 static void get_signals(MGSLPC_INFO *info);
399 static void set_signals(MGSLPC_INFO *info);
400
401 static void reset_device(MGSLPC_INFO *info);
402
403 static void hdlc_mode(MGSLPC_INFO *info);
404 static void async_mode(MGSLPC_INFO *info);
405
406 static void tx_timeout(unsigned long context);
407
408 static int ioctl_common(MGSLPC_INFO *info, unsigned int cmd, unsigned long arg);
409
410 #ifdef CONFIG_SYNCLINK_SYNCPPP
411 /* SPPP/HDLC stuff */
412 static void mgslpc_sppp_init(MGSLPC_INFO *info);
413 static void mgslpc_sppp_delete(MGSLPC_INFO *info);
414 static int mgslpc_sppp_open(struct net_device *d);
415 static int mgslpc_sppp_close(struct net_device *d);
416 static void mgslpc_sppp_tx_timeout(struct net_device *d);
417 static int mgslpc_sppp_tx(struct sk_buff *skb, struct net_device *d);
418 static void mgslpc_sppp_rx_done(MGSLPC_INFO *info, char *buf, int size);
419 static void mgslpc_sppp_tx_done(MGSLPC_INFO *info);
420 static int mgslpc_sppp_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
421 struct net_device_stats *mgslpc_net_stats(struct net_device *dev);
422 #endif
423
424 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
425
426 static BOOLEAN register_test(MGSLPC_INFO *info);
427 static BOOLEAN irq_test(MGSLPC_INFO *info);
428 static int adapter_test(MGSLPC_INFO *info);
429
430 static int claim_resources(MGSLPC_INFO *info);
431 static void release_resources(MGSLPC_INFO *info);
432 static void mgslpc_add_device(MGSLPC_INFO *info);
433 static void mgslpc_remove_device(MGSLPC_INFO *info);
434
435 static int rx_get_frame(MGSLPC_INFO *info);
436 static void rx_reset_buffers(MGSLPC_INFO *info);
437 static int rx_alloc_buffers(MGSLPC_INFO *info);
438 static void rx_free_buffers(MGSLPC_INFO *info);
439
440 static void mgslpc_isr(int irq, void *dev_id, struct pt_regs * regs);
441
442 /*
443 * Bottom half interrupt handlers
444 */
445 static void bh_handler(void* Context);
446 static void bh_transmit(MGSLPC_INFO *info);
447 static void bh_status(MGSLPC_INFO *info);
448
449 /*
450 * ioctl handlers
451 */
452 static int set_modem_info(MGSLPC_INFO *info, unsigned int cmd,
453 unsigned int *value);
454 static int get_modem_info(MGSLPC_INFO *info, unsigned int *value);
455 static int get_stats(MGSLPC_INFO *info, struct mgsl_icount *user_icount);
456 static int get_params(MGSLPC_INFO *info, MGSL_PARAMS *user_params);
457 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS *new_params);
458 static int get_txidle(MGSLPC_INFO *info, int*idle_mode);
459 static int set_txidle(MGSLPC_INFO *info, int idle_mode);
460 static int set_txenable(MGSLPC_INFO *info, int enable);
461 static int tx_abort(MGSLPC_INFO *info);
462 static int set_rxenable(MGSLPC_INFO *info, int enable);
463 static int wait_events(MGSLPC_INFO *info, int *mask);
464
465 #define jiffies_from_ms(a) ((((a) * HZ)/1000)+1)
466
467 static MGSLPC_INFO *mgslpc_device_list = NULL;
468 static int mgslpc_device_count = 0;
469
470 /*
471 * Set this param to non-zero to load eax with the
472 * .text section address and breakpoint on module load.
473 * This is useful for use with gdb and add-symbol-file command.
474 */
475 static int break_on_load=0;
476
477 /*
478 * Driver major number, defaults to zero to get auto
479 * assigned major number. May be forced as module parameter.
480 */
481 static int ttymajor=0;
482 static int cuamajor=0;
483
484 static int debug_level = 0;
485 static int maxframe[MAX_DEVICE_COUNT] = {0,};
486 static int dosyncppp[MAX_DEVICE_COUNT] = {1,1,1,1};
487
488 /* The old way: bit map of interrupts to choose from */
489 /* This means pick from 15, 14, 12, 11, 10, 9, 7, 5, 4, and 3 */
490 static u_int irq_mask = 0xdeb8;
491
492 /* Newer, simpler way of listing specific interrupts */
493 static int irq_list[4] = { -1 };
494
495 MODULE_PARM(irq_mask, "i");
496 MODULE_PARM(irq_list, "1-4i");
497
498 MODULE_PARM(break_on_load,"i");
499 MODULE_PARM(ttymajor,"i");
500 MODULE_PARM(cuamajor,"i");
501 MODULE_PARM(debug_level,"i");
502 MODULE_PARM(maxframe,"1-" __MODULE_STRING(MAX_DEVICE_COUNT) "i");
503 MODULE_PARM(dosyncppp,"1-" __MODULE_STRING(MAX_DEVICE_COUNT) "i");
504
505 #ifdef MODULE_LICENSE
506 MODULE_LICENSE("GPL");
507 #endif
508
509 static char *driver_name = "SyncLink PC Card driver";
510 static char *driver_version = "$Revision: 3.10 $";
511
512 static struct tty_driver serial_driver, callout_driver;
513 static int serial_refcount;
514
515 /* number of characters left in xmit buffer before we ask for more */
516 #define WAKEUP_CHARS 256
517
518 static void mgslpc_change_params(MGSLPC_INFO *info);
519 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
520
521 static struct tty_struct *serial_table[MAX_DEVICE_COUNT];
522 static struct termios *serial_termios[MAX_DEVICE_COUNT];
523 static struct termios *serial_termios_locked[MAX_DEVICE_COUNT];
524
525 #ifndef MIN
526 #define MIN(a,b) ((a) < (b) ? (a) : (b))
527 #endif
528
529 /* PCMCIA prototypes */
530
531 static void mgslpc_config(dev_link_t *link);
532 static void mgslpc_release(u_long arg);
533 static int mgslpc_event(event_t event, int priority,
534 event_callback_args_t *args);
535 static dev_link_t *mgslpc_attach(void);
536 static void mgslpc_detach(dev_link_t *);
537
538 static dev_info_t dev_info = "synclink_cs";
539 static dev_link_t *dev_list = NULL;
540
cs_error(client_handle_t handle,int func,int ret)541 static void cs_error(client_handle_t handle, int func, int ret)
542 {
543 error_info_t err = { func, ret };
544 CardServices(ReportError, handle, &err);
545 }
546
547 /*
548 * 1st function defined in .text section. Calling this function in
549 * init_module() followed by a breakpoint allows a remote debugger
550 * (gdb) to get the .text address for the add-symbol-file command.
551 * This allows remote debugging of dynamically loadable modules.
552 */
553 static void* mgslpc_get_text_ptr(void);
mgslpc_get_text_ptr()554 static void* mgslpc_get_text_ptr() {return mgslpc_get_text_ptr;}
555
556 /**
557 * line discipline callback wrappers
558 *
559 * The wrappers maintain line discipline references
560 * while calling into the line discipline.
561 *
562 * ldisc_receive_buf - pass receive data to line discipline
563 */
564
ldisc_receive_buf(struct tty_struct * tty,const __u8 * data,char * flags,int count)565 static void ldisc_receive_buf(struct tty_struct *tty,
566 const __u8 *data, char *flags, int count)
567 {
568 struct tty_ldisc *ld;
569 if (!tty)
570 return;
571 ld = tty_ldisc_ref(tty);
572 if (ld) {
573 if (ld->receive_buf)
574 ld->receive_buf(tty, data, flags, count);
575 tty_ldisc_deref(ld);
576 }
577 }
578
mgslpc_attach(void)579 static dev_link_t *mgslpc_attach(void)
580 {
581 MGSLPC_INFO *info;
582 dev_link_t *link;
583 client_reg_t client_reg;
584 int ret, i;
585
586 if (debug_level >= DEBUG_LEVEL_INFO)
587 printk("mgslpc_attach\n");
588
589 info = (MGSLPC_INFO *)kmalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
590 if (!info) {
591 printk("Error can't allocate device instance data\n");
592 return NULL;
593 }
594
595 memset(info, 0, sizeof(MGSLPC_INFO));
596 info->magic = MGSLPC_MAGIC;
597 info->task.sync = 0;
598 info->task.routine = bh_handler;
599 info->task.data = info;
600 info->max_frame_size = 4096;
601 info->close_delay = 5*HZ/10;
602 info->closing_wait = 30*HZ;
603 init_waitqueue_head(&info->open_wait);
604 init_waitqueue_head(&info->close_wait);
605 init_waitqueue_head(&info->status_event_wait_q);
606 init_waitqueue_head(&info->event_wait_q);
607 spin_lock_init(&info->lock);
608 spin_lock_init(&info->netlock);
609 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
610 info->idle_mode = HDLC_TXIDLE_FLAGS;
611 info->imra_value = 0xffff;
612 info->imrb_value = 0xffff;
613 info->pim_value = 0xff;
614
615 link = &info->link;
616 link->priv = info;
617
618 /* Initialize the dev_link_t structure */
619 link->release.function = &mgslpc_release;
620 link->release.data = (u_long)link;
621
622 /* Interrupt setup */
623 link->irq.Attributes = IRQ_TYPE_EXCLUSIVE;
624 link->irq.IRQInfo1 = IRQ_INFO2_VALID | IRQ_LEVEL_ID;
625 if (irq_list[0] == -1)
626 link->irq.IRQInfo2 = irq_mask;
627 else
628 for (i = 0; i < 4; i++)
629 link->irq.IRQInfo2 |= 1 << irq_list[i];
630 link->irq.Handler = NULL;
631
632 link->conf.Attributes = 0;
633 link->conf.Vcc = 50;
634 link->conf.IntType = INT_MEMORY_AND_IO;
635
636 /* Register with Card Services */
637 link->next = dev_list;
638 dev_list = link;
639
640 client_reg.dev_info = &dev_info;
641 client_reg.Attributes = INFO_IO_CLIENT | INFO_CARD_SHARE;
642 client_reg.EventMask =
643 CS_EVENT_CARD_INSERTION | CS_EVENT_CARD_REMOVAL |
644 CS_EVENT_RESET_PHYSICAL | CS_EVENT_CARD_RESET |
645 CS_EVENT_PM_SUSPEND | CS_EVENT_PM_RESUME;
646 client_reg.event_handler = &mgslpc_event;
647 client_reg.Version = 0x0210;
648 client_reg.event_callback_args.client_data = link;
649
650 ret = CardServices(RegisterClient, &link->handle, &client_reg);
651 if (ret != CS_SUCCESS) {
652 cs_error(link->handle, RegisterClient, ret);
653 mgslpc_detach(link);
654 return NULL;
655 }
656
657 mgslpc_add_device(info);
658
659 memset(serial_table,0,sizeof(struct tty_struct*)*MAX_DEVICE_COUNT);
660 memset(serial_termios,0,sizeof(struct termios*)*MAX_DEVICE_COUNT);
661 memset(serial_termios_locked,0,sizeof(struct termios*)*MAX_DEVICE_COUNT);
662
663 info->callout_termios = callout_driver.init_termios;
664 info->normal_termios = serial_driver.init_termios;
665
666 return link;
667 }
668
669 /* Card has been inserted.
670 */
671
672 #define CS_CHECK(fn, args...) \
673 while ((last_ret=CardServices(last_fn=(fn),args))!=0) goto cs_failed
674
mgslpc_config(dev_link_t * link)675 static void mgslpc_config(dev_link_t *link)
676 {
677 client_handle_t handle = link->handle;
678 MGSLPC_INFO *info = link->priv;
679 tuple_t tuple;
680 cisparse_t parse;
681 int last_fn, last_ret;
682 u_char buf[64];
683 config_info_t conf;
684 cistpl_cftable_entry_t dflt = { 0 };
685 cistpl_cftable_entry_t *cfg;
686
687 if (debug_level >= DEBUG_LEVEL_INFO)
688 printk("mgslpc_config(0x%p)\n", link);
689
690 /* read CONFIG tuple to find its configuration registers */
691 tuple.DesiredTuple = CISTPL_CONFIG;
692 tuple.Attributes = 0;
693 tuple.TupleData = buf;
694 tuple.TupleDataMax = sizeof(buf);
695 tuple.TupleOffset = 0;
696 CS_CHECK(GetFirstTuple, handle, &tuple);
697 CS_CHECK(GetTupleData, handle, &tuple);
698 CS_CHECK(ParseTuple, handle, &tuple, &parse);
699 link->conf.ConfigBase = parse.config.base;
700 link->conf.Present = parse.config.rmask[0];
701
702 /* Configure card */
703 link->state |= DEV_CONFIG;
704
705 /* Look up the current Vcc */
706 CS_CHECK(GetConfigurationInfo, handle, &conf);
707 link->conf.Vcc = conf.Vcc;
708
709 /* get CIS configuration entry */
710
711 tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
712 CS_CHECK(GetFirstTuple, handle, &tuple);
713
714 cfg = &(parse.cftable_entry);
715 CS_CHECK(GetTupleData, handle, &tuple);
716 CS_CHECK(ParseTuple, handle, &tuple, &parse);
717
718 if (cfg->flags & CISTPL_CFTABLE_DEFAULT) dflt = *cfg;
719 if (cfg->index == 0)
720 goto cs_failed;
721
722 link->conf.ConfigIndex = cfg->index;
723 link->conf.Attributes |= CONF_ENABLE_IRQ;
724
725 /* IO window settings */
726 link->io.NumPorts1 = 0;
727 if ((cfg->io.nwin > 0) || (dflt.io.nwin > 0)) {
728 cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt.io;
729 link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
730 if (!(io->flags & CISTPL_IO_8BIT))
731 link->io.Attributes1 = IO_DATA_PATH_WIDTH_16;
732 if (!(io->flags & CISTPL_IO_16BIT))
733 link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
734 link->io.IOAddrLines = io->flags & CISTPL_IO_LINES_MASK;
735 link->io.BasePort1 = io->win[0].base;
736 link->io.NumPorts1 = io->win[0].len;
737 CS_CHECK(RequestIO, link->handle, &link->io);
738 }
739
740 link->conf.Attributes = CONF_ENABLE_IRQ;
741 link->conf.Vcc = 50;
742 link->conf.IntType = INT_MEMORY_AND_IO;
743 link->conf.ConfigIndex = 8;
744 link->conf.Present = PRESENT_OPTION;
745
746 link->irq.Attributes |= IRQ_HANDLE_PRESENT;
747 link->irq.Handler = mgslpc_isr;
748 link->irq.Instance = info;
749 CS_CHECK(RequestIRQ, link->handle, &link->irq);
750
751 CS_CHECK(RequestConfiguration, link->handle, &link->conf);
752
753 info->io_base = link->io.BasePort1;
754 info->irq_level = link->irq.AssignedIRQ;
755
756 /* add to linked list of devices */
757 sprintf(info->node.dev_name, "mgslpc0");
758 info->node.major = info->node.minor = 0;
759 link->dev = &info->node;
760
761 printk(KERN_INFO "%s: index 0x%02x:",
762 info->node.dev_name, link->conf.ConfigIndex);
763 if (link->conf.Attributes & CONF_ENABLE_IRQ)
764 printk(", irq %d", link->irq.AssignedIRQ);
765 if (link->io.NumPorts1)
766 printk(", io 0x%04x-0x%04x", link->io.BasePort1,
767 link->io.BasePort1+link->io.NumPorts1-1);
768 printk("\n");
769
770 link->state &= ~DEV_CONFIG_PENDING;
771 return;
772
773 cs_failed:
774 cs_error(link->handle, last_fn, last_ret);
775 mgslpc_release((u_long)link);
776 }
777
778 /* Card has been removed.
779 * Unregister device and release PCMCIA configuration.
780 * If device is open, postpone until it is closed.
781 */
mgslpc_release(u_long arg)782 static void mgslpc_release(u_long arg)
783 {
784 dev_link_t *link = (dev_link_t *)arg;
785
786 if (debug_level >= DEBUG_LEVEL_INFO)
787 printk("mgslpc_release(0x%p)\n", link);
788
789 if (link->open) {
790 if (debug_level >= DEBUG_LEVEL_INFO)
791 printk("synclink_cs: release postponed, '%s' still open\n",
792 link->dev->dev_name);
793 link->state |= DEV_STALE_CONFIG;
794 return;
795 }
796
797 /* Unlink the device chain */
798 link->dev = NULL;
799 link->state &= ~DEV_CONFIG;
800
801 CardServices(ReleaseConfiguration, link->handle);
802 if (link->io.NumPorts1)
803 CardServices(ReleaseIO, link->handle, &link->io);
804 if (link->irq.AssignedIRQ)
805 CardServices(ReleaseIRQ, link->handle, &link->irq);
806 if (link->state & DEV_STALE_LINK)
807 mgslpc_detach(link);
808 }
809
mgslpc_detach(dev_link_t * link)810 static void mgslpc_detach(dev_link_t *link)
811 {
812 dev_link_t **linkp;
813
814 if (debug_level >= DEBUG_LEVEL_INFO)
815 printk("mgslpc_detach(0x%p)\n", link);
816
817 /* find device */
818 for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next)
819 if (*linkp == link) break;
820 if (*linkp == NULL)
821 return;
822
823 if (link->state & DEV_CONFIG) {
824 /* device is configured/active, mark it so when
825 * release() is called a proper detach() occurs.
826 */
827 if (debug_level >= DEBUG_LEVEL_INFO)
828 printk(KERN_DEBUG "synclinkpc: detach postponed, '%s' "
829 "still locked\n", link->dev->dev_name);
830 link->state |= DEV_STALE_LINK;
831 return;
832 }
833
834 /* Break the link with Card Services */
835 if (link->handle)
836 CardServices(DeregisterClient, link->handle);
837
838 /* Unlink device structure, and free it */
839 *linkp = link->next;
840 mgslpc_remove_device((MGSLPC_INFO *)link->priv);
841 }
842
mgslpc_event(event_t event,int priority,event_callback_args_t * args)843 static int mgslpc_event(event_t event, int priority,
844 event_callback_args_t *args)
845 {
846 dev_link_t *link = args->client_data;
847 MGSLPC_INFO *info = link->priv;
848
849 if (debug_level >= DEBUG_LEVEL_INFO)
850 printk("mgslpc_event(0x%06x)\n", event);
851
852 switch (event) {
853 case CS_EVENT_CARD_REMOVAL:
854 link->state &= ~DEV_PRESENT;
855 if (link->state & DEV_CONFIG) {
856 ((MGSLPC_INFO *)link->priv)->stop = 1;
857 mod_timer(&link->release, jiffies + HZ/20);
858 }
859 break;
860 case CS_EVENT_CARD_INSERTION:
861 link->state |= DEV_PRESENT | DEV_CONFIG_PENDING;
862 info->bus = args->bus;
863 mgslpc_config(link);
864 break;
865 case CS_EVENT_PM_SUSPEND:
866 link->state |= DEV_SUSPEND;
867 /* Fall through... */
868 case CS_EVENT_RESET_PHYSICAL:
869 /* Mark the device as stopped, to block IO until later */
870 info->stop = 1;
871 if (link->state & DEV_CONFIG)
872 CardServices(ReleaseConfiguration, link->handle);
873 break;
874 case CS_EVENT_PM_RESUME:
875 link->state &= ~DEV_SUSPEND;
876 /* Fall through... */
877 case CS_EVENT_CARD_RESET:
878 if (link->state & DEV_CONFIG)
879 CardServices(RequestConfiguration, link->handle, &link->conf);
880 info->stop = 0;
881 break;
882 }
883 return 0;
884 }
885
mgslpc_paranoia_check(MGSLPC_INFO * info,kdev_t device,const char * routine)886 static inline int mgslpc_paranoia_check(MGSLPC_INFO *info,
887 kdev_t device, const char *routine)
888 {
889 #ifdef MGSLPC_PARANOIA_CHECK
890 static const char *badmagic =
891 "Warning: bad magic number for mgsl struct (%s) in %s\n";
892 static const char *badinfo =
893 "Warning: null mgslpc_info for (%s) in %s\n";
894
895 if (!info) {
896 printk(badinfo, kdevname(device), routine);
897 return 1;
898 }
899 if (info->magic != MGSLPC_MAGIC) {
900 printk(badmagic, kdevname(device), routine);
901 return 1;
902 }
903 #else
904 if (!info)
905 return 1;
906 #endif
907 return 0;
908 }
909
910
911 #define CMD_RXFIFO BIT7 // release current rx FIFO
912 #define CMD_RXRESET BIT6 // receiver reset
913 #define CMD_RXFIFO_READ BIT5
914 #define CMD_START_TIMER BIT4
915 #define CMD_TXFIFO BIT3 // release current tx FIFO
916 #define CMD_TXEOM BIT1 // transmit end message
917 #define CMD_TXRESET BIT0 // transmit reset
918
wait_command_complete(MGSLPC_INFO * info,unsigned char channel)919 static BOOLEAN wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
920 {
921 int i = 0;
922 unsigned char status;
923 /* wait for command completion */
924 while ((status = read_reg(info, (unsigned char)(channel+STAR)) & BIT2)) {
925 udelay(1);
926 if (i++ == 1000)
927 return FALSE;
928 }
929 return TRUE;
930 }
931
issue_command(MGSLPC_INFO * info,unsigned char channel,unsigned char cmd)932 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
933 {
934 wait_command_complete(info, channel);
935 write_reg(info, (unsigned char) (channel + CMDR), cmd);
936 }
937
tx_pause(struct tty_struct * tty)938 static void tx_pause(struct tty_struct *tty)
939 {
940 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
941 unsigned long flags;
942
943 if (mgslpc_paranoia_check(info, tty->device, "tx_pause"))
944 return;
945 if (debug_level >= DEBUG_LEVEL_INFO)
946 printk("tx_pause(%s)\n",info->device_name);
947
948 spin_lock_irqsave(&info->lock,flags);
949 if (info->tx_enabled)
950 tx_stop(info);
951 spin_unlock_irqrestore(&info->lock,flags);
952 }
953
tx_release(struct tty_struct * tty)954 static void tx_release(struct tty_struct *tty)
955 {
956 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
957 unsigned long flags;
958
959 if (mgslpc_paranoia_check(info, tty->device, "tx_release"))
960 return;
961 if (debug_level >= DEBUG_LEVEL_INFO)
962 printk("tx_release(%s)\n",info->device_name);
963
964 spin_lock_irqsave(&info->lock,flags);
965 if (!info->tx_enabled)
966 tx_start(info);
967 spin_unlock_irqrestore(&info->lock,flags);
968 }
969
970 /* Return next bottom half action to perform.
971 * or 0 if nothing to do.
972 */
bh_action(MGSLPC_INFO * info)973 int bh_action(MGSLPC_INFO *info)
974 {
975 unsigned long flags;
976 int rc = 0;
977
978 spin_lock_irqsave(&info->lock,flags);
979
980 if (info->pending_bh & BH_RECEIVE) {
981 info->pending_bh &= ~BH_RECEIVE;
982 rc = BH_RECEIVE;
983 } else if (info->pending_bh & BH_TRANSMIT) {
984 info->pending_bh &= ~BH_TRANSMIT;
985 rc = BH_TRANSMIT;
986 } else if (info->pending_bh & BH_STATUS) {
987 info->pending_bh &= ~BH_STATUS;
988 rc = BH_STATUS;
989 }
990
991 if (!rc) {
992 /* Mark BH routine as complete */
993 info->bh_running = 0;
994 info->bh_requested = 0;
995 }
996
997 spin_unlock_irqrestore(&info->lock,flags);
998
999 return rc;
1000 }
1001
bh_handler(void * Context)1002 void bh_handler(void* Context)
1003 {
1004 MGSLPC_INFO *info = (MGSLPC_INFO*)Context;
1005 int action;
1006
1007 if (!info)
1008 return;
1009
1010 if (debug_level >= DEBUG_LEVEL_BH)
1011 printk( "%s(%d):bh_handler(%s) entry\n",
1012 __FILE__,__LINE__,info->device_name);
1013
1014 info->bh_running = 1;
1015
1016 while((action = bh_action(info)) != 0) {
1017
1018 /* Process work item */
1019 if ( debug_level >= DEBUG_LEVEL_BH )
1020 printk( "%s(%d):bh_handler() work item action=%d\n",
1021 __FILE__,__LINE__,action);
1022
1023 switch (action) {
1024
1025 case BH_RECEIVE:
1026 while(rx_get_frame(info));
1027 break;
1028 case BH_TRANSMIT:
1029 bh_transmit(info);
1030 break;
1031 case BH_STATUS:
1032 bh_status(info);
1033 break;
1034 default:
1035 /* unknown work item ID */
1036 printk("Unknown work item ID=%08X!\n", action);
1037 break;
1038 }
1039 }
1040
1041 if (debug_level >= DEBUG_LEVEL_BH)
1042 printk( "%s(%d):bh_handler(%s) exit\n",
1043 __FILE__,__LINE__,info->device_name);
1044 }
1045
bh_transmit(MGSLPC_INFO * info)1046 void bh_transmit(MGSLPC_INFO *info)
1047 {
1048 struct tty_struct *tty = info->tty;
1049 if (debug_level >= DEBUG_LEVEL_BH)
1050 printk("bh_transmit() entry on %s\n", info->device_name);
1051
1052 if (tty) {
1053 tty_wakeup(tty);
1054 wake_up_interruptible(&tty->write_wait);
1055 }
1056 }
1057
bh_status(MGSLPC_INFO * info)1058 void bh_status(MGSLPC_INFO *info)
1059 {
1060 info->ri_chkcount = 0;
1061 info->dsr_chkcount = 0;
1062 info->dcd_chkcount = 0;
1063 info->cts_chkcount = 0;
1064 }
1065
1066 /* eom: non-zero = end of frame */
rx_ready_hdlc(MGSLPC_INFO * info,int eom)1067 void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
1068 {
1069 unsigned char data[2];
1070 unsigned char fifo_count, read_count, i;
1071 RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
1072
1073 if (debug_level >= DEBUG_LEVEL_ISR)
1074 printk("%s(%d):rx_ready_hdlc(eom=%d)\n",__FILE__,__LINE__,eom);
1075
1076 if (!info->rx_enabled)
1077 return;
1078
1079 if (info->rx_frame_count >= info->rx_buf_count) {
1080 /* no more free buffers */
1081 issue_command(info, CHA, CMD_RXRESET);
1082 info->pending_bh |= BH_RECEIVE;
1083 info->rx_overflow = 1;
1084 info->icount.buf_overrun++;
1085 return;
1086 }
1087
1088 if (eom) {
1089 /* end of frame, get FIFO count from RBCL register */
1090 if (!(fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f)))
1091 fifo_count = 32;
1092 } else
1093 fifo_count = 32;
1094
1095 do {
1096 if (fifo_count == 1) {
1097 read_count = 1;
1098 data[0] = read_reg(info, CHA + RXFIFO);
1099 } else {
1100 read_count = 2;
1101 *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
1102 }
1103 fifo_count -= read_count;
1104 if (!fifo_count && eom)
1105 buf->status = data[--read_count];
1106
1107 for (i = 0; i < read_count; i++) {
1108 if (buf->count >= info->max_frame_size) {
1109 /* frame too large, reset receiver and reset current buffer */
1110 issue_command(info, CHA, CMD_RXRESET);
1111 buf->count = 0;
1112 return;
1113 }
1114 *(buf->data + buf->count) = data[i];
1115 buf->count++;
1116 }
1117 } while (fifo_count);
1118
1119 if (eom) {
1120 info->pending_bh |= BH_RECEIVE;
1121 info->rx_frame_count++;
1122 info->rx_put++;
1123 if (info->rx_put >= info->rx_buf_count)
1124 info->rx_put = 0;
1125 }
1126 issue_command(info, CHA, CMD_RXFIFO);
1127 }
1128
rx_ready_async(MGSLPC_INFO * info,int tcd)1129 void rx_ready_async(MGSLPC_INFO *info, int tcd)
1130 {
1131 unsigned char data, status;
1132 int fifo_count;
1133 struct tty_struct *tty = info->tty;
1134 struct mgsl_icount *icount = &info->icount;
1135
1136 if (tcd) {
1137 /* early termination, get FIFO count from RBCL register */
1138 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
1139
1140 /* Zero fifo count could mean 0 or 32 bytes available.
1141 * If BIT5 of STAR is set then at least 1 byte is available.
1142 */
1143 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
1144 fifo_count = 32;
1145 } else
1146 fifo_count = 32;
1147
1148 /* Flush received async data to receive data buffer. */
1149 while (fifo_count) {
1150 data = read_reg(info, CHA + RXFIFO);
1151 status = read_reg(info, CHA + RXFIFO);
1152 fifo_count -= 2;
1153
1154 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
1155 break;
1156
1157 *tty->flip.char_buf_ptr = data;
1158 icount->rx++;
1159
1160 *tty->flip.flag_buf_ptr = 0;
1161
1162 // if no frameing/crc error then save data
1163 // BIT7:parity error
1164 // BIT6:framing error
1165
1166 if (status & (BIT7 + BIT6)) {
1167 if (status & BIT7)
1168 icount->parity++;
1169 else
1170 icount->frame++;
1171
1172 /* discard char if tty control flags say so */
1173 if (status & info->ignore_status_mask)
1174 continue;
1175
1176 status &= info->read_status_mask;
1177
1178 if (status & BIT7)
1179 *tty->flip.flag_buf_ptr = TTY_PARITY;
1180 else if (status & BIT6)
1181 *tty->flip.flag_buf_ptr = TTY_FRAME;
1182 }
1183
1184 tty->flip.flag_buf_ptr++;
1185 tty->flip.char_buf_ptr++;
1186 tty->flip.count++;
1187 }
1188 issue_command(info, CHA, CMD_RXFIFO);
1189
1190 if (debug_level >= DEBUG_LEVEL_ISR) {
1191 printk("%s(%d):rx_ready_async count=%d\n",
1192 __FILE__,__LINE__,tty->flip.count);
1193 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1194 __FILE__,__LINE__,icount->rx,icount->brk,
1195 icount->parity,icount->frame,icount->overrun);
1196 }
1197
1198 if (tty->flip.count)
1199 tty_flip_buffer_push(tty);
1200 }
1201
1202
tx_done(MGSLPC_INFO * info)1203 void tx_done(MGSLPC_INFO *info)
1204 {
1205 if (!info->tx_active)
1206 return;
1207
1208 info->tx_active = 0;
1209 info->tx_aborting = 0;
1210
1211 if (info->params.mode == MGSL_MODE_ASYNC)
1212 return;
1213
1214 info->tx_count = info->tx_put = info->tx_get = 0;
1215 del_timer(&info->tx_timer);
1216
1217 if (info->drop_rts_on_tx_done) {
1218 get_signals(info);
1219 if (info->serial_signals & SerialSignal_RTS) {
1220 info->serial_signals &= ~SerialSignal_RTS;
1221 set_signals(info);
1222 }
1223 info->drop_rts_on_tx_done = 0;
1224 }
1225
1226 #ifdef CONFIG_SYNCLINK_SYNCPPP
1227 if (info->netcount)
1228 mgslpc_sppp_tx_done(info);
1229 else
1230 #endif
1231 {
1232 if (info->tty->stopped || info->tty->hw_stopped) {
1233 tx_stop(info);
1234 return;
1235 }
1236 info->pending_bh |= BH_TRANSMIT;
1237 }
1238 }
1239
tx_ready(MGSLPC_INFO * info)1240 void tx_ready(MGSLPC_INFO *info)
1241 {
1242 unsigned char fifo_count = 32;
1243 int c;
1244
1245 if (debug_level >= DEBUG_LEVEL_ISR)
1246 printk("%s(%d):tx_ready(%s)\n", __FILE__,__LINE__,info->device_name);
1247
1248 if (info->params.mode == MGSL_MODE_HDLC) {
1249 if (!info->tx_active)
1250 return;
1251 } else {
1252 if (info->tty->stopped || info->tty->hw_stopped) {
1253 tx_stop(info);
1254 return;
1255 }
1256 if (!info->tx_count)
1257 info->tx_active = 0;
1258 }
1259
1260 if (!info->tx_count)
1261 return;
1262
1263 while (info->tx_count && fifo_count) {
1264 c = MIN(2, MIN(fifo_count, MIN(info->tx_count, TXBUFSIZE - info->tx_get)));
1265
1266 if (c == 1) {
1267 write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1268 } else {
1269 write_reg16(info, CHA + TXFIFO,
1270 *((unsigned short*)(info->tx_buf + info->tx_get)));
1271 }
1272 info->tx_count -= c;
1273 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1274 fifo_count -= c;
1275 }
1276
1277 if (info->params.mode == MGSL_MODE_ASYNC) {
1278 if (info->tx_count < WAKEUP_CHARS)
1279 info->pending_bh |= BH_TRANSMIT;
1280 issue_command(info, CHA, CMD_TXFIFO);
1281 } else {
1282 if (info->tx_count)
1283 issue_command(info, CHA, CMD_TXFIFO);
1284 else
1285 issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1286 }
1287 }
1288
cts_change(MGSLPC_INFO * info)1289 void cts_change(MGSLPC_INFO *info)
1290 {
1291 get_signals(info);
1292 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1293 irq_disable(info, CHB, IRQ_CTS);
1294 info->icount.cts++;
1295 if (info->serial_signals & SerialSignal_CTS)
1296 info->input_signal_events.cts_up++;
1297 else
1298 info->input_signal_events.cts_down++;
1299 wake_up_interruptible(&info->status_event_wait_q);
1300 wake_up_interruptible(&info->event_wait_q);
1301
1302 if (info->flags & ASYNC_CTS_FLOW) {
1303 if (info->tty->hw_stopped) {
1304 if (info->serial_signals & SerialSignal_CTS) {
1305 if (debug_level >= DEBUG_LEVEL_ISR)
1306 printk("CTS tx start...");
1307 if (info->tty)
1308 info->tty->hw_stopped = 0;
1309 tx_start(info);
1310 info->pending_bh |= BH_TRANSMIT;
1311 return;
1312 }
1313 } else {
1314 if (!(info->serial_signals & SerialSignal_CTS)) {
1315 if (debug_level >= DEBUG_LEVEL_ISR)
1316 printk("CTS tx stop...");
1317 if (info->tty)
1318 info->tty->hw_stopped = 1;
1319 tx_stop(info);
1320 }
1321 }
1322 }
1323 info->pending_bh |= BH_STATUS;
1324 }
1325
dcd_change(MGSLPC_INFO * info)1326 void dcd_change(MGSLPC_INFO *info)
1327 {
1328 get_signals(info);
1329 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1330 irq_disable(info, CHB, IRQ_DCD);
1331 info->icount.dcd++;
1332 if (info->serial_signals & SerialSignal_DCD) {
1333 info->input_signal_events.dcd_up++;
1334 #ifdef CONFIG_SYNCLINK_SYNCPPP
1335 if (info->netcount)
1336 sppp_reopen(info->netdev);
1337 #endif
1338 }
1339 else
1340 info->input_signal_events.dcd_down++;
1341 wake_up_interruptible(&info->status_event_wait_q);
1342 wake_up_interruptible(&info->event_wait_q);
1343
1344 if (info->flags & ASYNC_CHECK_CD) {
1345 if (debug_level >= DEBUG_LEVEL_ISR)
1346 printk("%s CD now %s...", info->device_name,
1347 (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1348 if (info->serial_signals & SerialSignal_DCD)
1349 wake_up_interruptible(&info->open_wait);
1350 else if (!(info->flags & (ASYNC_CALLOUT_ACTIVE | ASYNC_CALLOUT_NOHUP))) {
1351 if (debug_level >= DEBUG_LEVEL_ISR)
1352 printk("doing serial hangup...");
1353 if (info->tty)
1354 tty_hangup(info->tty);
1355 }
1356 }
1357 info->pending_bh |= BH_STATUS;
1358 }
1359
dsr_change(MGSLPC_INFO * info)1360 void dsr_change(MGSLPC_INFO *info)
1361 {
1362 get_signals(info);
1363 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1364 port_irq_disable(info, PVR_DSR);
1365 info->icount.dsr++;
1366 if (info->serial_signals & SerialSignal_DSR)
1367 info->input_signal_events.dsr_up++;
1368 else
1369 info->input_signal_events.dsr_down++;
1370 wake_up_interruptible(&info->status_event_wait_q);
1371 wake_up_interruptible(&info->event_wait_q);
1372 info->pending_bh |= BH_STATUS;
1373 }
1374
ri_change(MGSLPC_INFO * info)1375 void ri_change(MGSLPC_INFO *info)
1376 {
1377 get_signals(info);
1378 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1379 port_irq_disable(info, PVR_RI);
1380 info->icount.rng++;
1381 if (info->serial_signals & SerialSignal_RI)
1382 info->input_signal_events.ri_up++;
1383 else
1384 info->input_signal_events.ri_down++;
1385 wake_up_interruptible(&info->status_event_wait_q);
1386 wake_up_interruptible(&info->event_wait_q);
1387 info->pending_bh |= BH_STATUS;
1388 }
1389
1390 /* Interrupt service routine entry point.
1391 *
1392 * Arguments:
1393 *
1394 * irq interrupt number that caused interrupt
1395 * dev_id device ID supplied during interrupt registration
1396 * regs interrupted processor context
1397 */
mgslpc_isr(int irq,void * dev_id,struct pt_regs * regs)1398 static void mgslpc_isr(int irq, void *dev_id, struct pt_regs * regs)
1399 {
1400 MGSLPC_INFO * info = (MGSLPC_INFO *)dev_id;
1401 unsigned short isr;
1402 unsigned char gis, pis;
1403 int count=0;
1404
1405 if (debug_level >= DEBUG_LEVEL_ISR)
1406 printk("mgslpc_isr(%d) entry.\n", irq);
1407 if (!info)
1408 return;
1409
1410 if (!(info->link.state & DEV_CONFIG))
1411 return;
1412
1413 spin_lock(&info->lock);
1414
1415 while ((gis = read_reg(info, CHA + GIS))) {
1416 if (debug_level >= DEBUG_LEVEL_ISR)
1417 printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1418
1419 if ((gis & 0x70) || count > 1000) {
1420 printk("synclink_cs:hardware failed or ejected\n");
1421 break;
1422 }
1423 count++;
1424
1425 if (gis & (BIT1 + BIT0)) {
1426 isr = read_reg16(info, CHB + ISR);
1427 if (isr & IRQ_DCD)
1428 dcd_change(info);
1429 if (isr & IRQ_CTS)
1430 cts_change(info);
1431 }
1432 if (gis & (BIT3 + BIT2))
1433 {
1434 isr = read_reg16(info, CHA + ISR);
1435 if (isr & IRQ_TIMER) {
1436 info->irq_occurred = 1;
1437 irq_disable(info, CHA, IRQ_TIMER);
1438 }
1439
1440 /* receive IRQs */
1441 if (isr & IRQ_EXITHUNT) {
1442 info->icount.exithunt++;
1443 wake_up_interruptible(&info->event_wait_q);
1444 }
1445 if (isr & IRQ_BREAK_ON) {
1446 info->icount.brk++;
1447 if (info->flags & ASYNC_SAK)
1448 do_SAK(info->tty);
1449 }
1450 if (isr & IRQ_RXTIME) {
1451 issue_command(info, CHA, CMD_RXFIFO_READ);
1452 }
1453 if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1454 if (info->params.mode == MGSL_MODE_HDLC)
1455 rx_ready_hdlc(info, isr & IRQ_RXEOM);
1456 else
1457 rx_ready_async(info, isr & IRQ_RXEOM);
1458 }
1459
1460 /* transmit IRQs */
1461 if (isr & IRQ_UNDERRUN) {
1462 if (info->tx_aborting)
1463 info->icount.txabort++;
1464 else
1465 info->icount.txunder++;
1466 tx_done(info);
1467 }
1468 else if (isr & IRQ_ALLSENT) {
1469 info->icount.txok++;
1470 tx_done(info);
1471 }
1472 else if (isr & IRQ_TXFIFO)
1473 tx_ready(info);
1474 }
1475 if (gis & BIT7) {
1476 pis = read_reg(info, CHA + PIS);
1477 if (pis & BIT1)
1478 dsr_change(info);
1479 if (pis & BIT2)
1480 ri_change(info);
1481 }
1482 }
1483
1484 /* Request bottom half processing if there's something
1485 * for it to do and the bh is not already running
1486 */
1487
1488 if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1489 if ( debug_level >= DEBUG_LEVEL_ISR )
1490 printk("%s(%d):%s queueing bh task.\n",
1491 __FILE__,__LINE__,info->device_name);
1492 queue_task(&info->task, &tq_immediate);
1493 mark_bh(IMMEDIATE_BH);
1494 info->bh_requested = 1;
1495 }
1496
1497 spin_unlock(&info->lock);
1498
1499 if (debug_level >= DEBUG_LEVEL_ISR)
1500 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1501 __FILE__,__LINE__,irq);
1502 }
1503
1504 /* Initialize and start device.
1505 */
startup(MGSLPC_INFO * info)1506 static int startup(MGSLPC_INFO * info)
1507 {
1508 int retval = 0;
1509
1510 if (debug_level >= DEBUG_LEVEL_INFO)
1511 printk("%s(%d):startup(%s)\n",__FILE__,__LINE__,info->device_name);
1512
1513 if (info->flags & ASYNC_INITIALIZED)
1514 return 0;
1515
1516 if (!info->tx_buf) {
1517 /* allocate a page of memory for a transmit buffer */
1518 info->tx_buf = (unsigned char *)get_free_page(GFP_KERNEL);
1519 if (!info->tx_buf) {
1520 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1521 __FILE__,__LINE__,info->device_name);
1522 return -ENOMEM;
1523 }
1524 }
1525
1526 info->pending_bh = 0;
1527
1528 init_timer(&info->tx_timer);
1529 info->tx_timer.data = (unsigned long)info;
1530 info->tx_timer.function = tx_timeout;
1531
1532 /* Allocate and claim adapter resources */
1533 retval = claim_resources(info);
1534
1535 /* perform existance check and diagnostics */
1536 if ( !retval )
1537 retval = adapter_test(info);
1538
1539 if ( retval ) {
1540 if (capable(CAP_SYS_ADMIN) && info->tty)
1541 set_bit(TTY_IO_ERROR, &info->tty->flags);
1542 release_resources(info);
1543 return retval;
1544 }
1545
1546 /* program hardware for current parameters */
1547 mgslpc_change_params(info);
1548
1549 if (info->tty)
1550 clear_bit(TTY_IO_ERROR, &info->tty->flags);
1551
1552 info->flags |= ASYNC_INITIALIZED;
1553
1554 return 0;
1555 }
1556
1557 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1558 */
shutdown(MGSLPC_INFO * info)1559 static void shutdown(MGSLPC_INFO * info)
1560 {
1561 unsigned long flags;
1562
1563 if (!(info->flags & ASYNC_INITIALIZED))
1564 return;
1565
1566 if (debug_level >= DEBUG_LEVEL_INFO)
1567 printk("%s(%d):mgslpc_shutdown(%s)\n",
1568 __FILE__,__LINE__, info->device_name );
1569
1570 /* clear status wait queue because status changes */
1571 /* can't happen after shutting down the hardware */
1572 wake_up_interruptible(&info->status_event_wait_q);
1573 wake_up_interruptible(&info->event_wait_q);
1574
1575 del_timer(&info->tx_timer);
1576
1577 if (info->tx_buf) {
1578 free_page((unsigned long) info->tx_buf);
1579 info->tx_buf = 0;
1580 }
1581
1582 spin_lock_irqsave(&info->lock,flags);
1583
1584 rx_stop(info);
1585 tx_stop(info);
1586
1587 /* TODO:disable interrupts instead of reset to preserve signal states */
1588 reset_device(info);
1589
1590 if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
1591 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1592 set_signals(info);
1593 }
1594
1595 spin_unlock_irqrestore(&info->lock,flags);
1596
1597 release_resources(info);
1598
1599 if (info->tty)
1600 set_bit(TTY_IO_ERROR, &info->tty->flags);
1601
1602 info->flags &= ~ASYNC_INITIALIZED;
1603 }
1604
mgslpc_program_hw(MGSLPC_INFO * info)1605 static void mgslpc_program_hw(MGSLPC_INFO *info)
1606 {
1607 unsigned long flags;
1608
1609 spin_lock_irqsave(&info->lock,flags);
1610
1611 rx_stop(info);
1612 tx_stop(info);
1613 info->tx_count = info->tx_put = info->tx_get = 0;
1614
1615 if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1616 hdlc_mode(info);
1617 else
1618 async_mode(info);
1619
1620 set_signals(info);
1621
1622 info->dcd_chkcount = 0;
1623 info->cts_chkcount = 0;
1624 info->ri_chkcount = 0;
1625 info->dsr_chkcount = 0;
1626
1627 irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1628 port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1629 get_signals(info);
1630
1631 if (info->netcount || info->tty->termios->c_cflag & CREAD)
1632 rx_start(info);
1633
1634 spin_unlock_irqrestore(&info->lock,flags);
1635 }
1636
1637 /* Reconfigure adapter based on new parameters
1638 */
mgslpc_change_params(MGSLPC_INFO * info)1639 static void mgslpc_change_params(MGSLPC_INFO *info)
1640 {
1641 unsigned cflag;
1642 int bits_per_char;
1643
1644 if (!info->tty || !info->tty->termios)
1645 return;
1646
1647 if (debug_level >= DEBUG_LEVEL_INFO)
1648 printk("%s(%d):mgslpc_change_params(%s)\n",
1649 __FILE__,__LINE__, info->device_name );
1650
1651 cflag = info->tty->termios->c_cflag;
1652
1653 /* if B0 rate (hangup) specified then negate DTR and RTS */
1654 /* otherwise assert DTR and RTS */
1655 if (cflag & CBAUD)
1656 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1657 else
1658 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1659
1660 /* byte size and parity */
1661
1662 switch (cflag & CSIZE) {
1663 case CS5: info->params.data_bits = 5; break;
1664 case CS6: info->params.data_bits = 6; break;
1665 case CS7: info->params.data_bits = 7; break;
1666 case CS8: info->params.data_bits = 8; break;
1667 default: info->params.data_bits = 7; break;
1668 }
1669
1670 if (cflag & CSTOPB)
1671 info->params.stop_bits = 2;
1672 else
1673 info->params.stop_bits = 1;
1674
1675 info->params.parity = ASYNC_PARITY_NONE;
1676 if (cflag & PARENB) {
1677 if (cflag & PARODD)
1678 info->params.parity = ASYNC_PARITY_ODD;
1679 else
1680 info->params.parity = ASYNC_PARITY_EVEN;
1681 #ifdef CMSPAR
1682 if (cflag & CMSPAR)
1683 info->params.parity = ASYNC_PARITY_SPACE;
1684 #endif
1685 }
1686
1687 /* calculate number of jiffies to transmit a full
1688 * FIFO (32 bytes) at specified data rate
1689 */
1690 bits_per_char = info->params.data_bits +
1691 info->params.stop_bits + 1;
1692
1693 /* if port data rate is set to 460800 or less then
1694 * allow tty settings to override, otherwise keep the
1695 * current data rate.
1696 */
1697 if (info->params.data_rate <= 460800) {
1698 info->params.data_rate = tty_get_baud_rate(info->tty);
1699 }
1700
1701 if ( info->params.data_rate ) {
1702 info->timeout = (32*HZ*bits_per_char) /
1703 info->params.data_rate;
1704 }
1705 info->timeout += HZ/50; /* Add .02 seconds of slop */
1706
1707 if (cflag & CRTSCTS)
1708 info->flags |= ASYNC_CTS_FLOW;
1709 else
1710 info->flags &= ~ASYNC_CTS_FLOW;
1711
1712 if (cflag & CLOCAL)
1713 info->flags &= ~ASYNC_CHECK_CD;
1714 else
1715 info->flags |= ASYNC_CHECK_CD;
1716
1717 /* process tty input control flags */
1718
1719 info->read_status_mask = 0;
1720 if (I_INPCK(info->tty))
1721 info->read_status_mask |= BIT7 | BIT6;
1722 if (I_IGNPAR(info->tty))
1723 info->ignore_status_mask |= BIT7 | BIT6;
1724
1725 mgslpc_program_hw(info);
1726 }
1727
1728 /* Add a character to the transmit buffer
1729 */
mgslpc_put_char(struct tty_struct * tty,unsigned char ch)1730 static void mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1731 {
1732 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1733 unsigned long flags;
1734
1735 if (debug_level >= DEBUG_LEVEL_INFO) {
1736 printk( "%s(%d):mgslpc_put_char(%d) on %s\n",
1737 __FILE__,__LINE__,ch,info->device_name);
1738 }
1739
1740 if (mgslpc_paranoia_check(info, tty->device, "mgslpc_put_char"))
1741 return;
1742
1743 if (!tty || !info->tx_buf)
1744 return;
1745
1746 spin_lock_irqsave(&info->lock,flags);
1747
1748 if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1749 if (info->tx_count < TXBUFSIZE - 1) {
1750 info->tx_buf[info->tx_put++] = ch;
1751 info->tx_put &= TXBUFSIZE-1;
1752 info->tx_count++;
1753 }
1754 }
1755
1756 spin_unlock_irqrestore(&info->lock,flags);
1757 }
1758
1759 /* Enable transmitter so remaining characters in the
1760 * transmit buffer are sent.
1761 */
mgslpc_flush_chars(struct tty_struct * tty)1762 static void mgslpc_flush_chars(struct tty_struct *tty)
1763 {
1764 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1765 unsigned long flags;
1766
1767 if (debug_level >= DEBUG_LEVEL_INFO)
1768 printk( "%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1769 __FILE__,__LINE__,info->device_name,info->tx_count);
1770
1771 if (mgslpc_paranoia_check(info, tty->device, "mgslpc_flush_chars"))
1772 return;
1773
1774 if (info->tx_count <= 0 || tty->stopped ||
1775 tty->hw_stopped || !info->tx_buf)
1776 return;
1777
1778 if (debug_level >= DEBUG_LEVEL_INFO)
1779 printk( "%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1780 __FILE__,__LINE__,info->device_name);
1781
1782 spin_lock_irqsave(&info->lock,flags);
1783 if (!info->tx_active)
1784 tx_start(info);
1785 spin_unlock_irqrestore(&info->lock,flags);
1786 }
1787
1788 /* Send a block of data
1789 *
1790 * Arguments:
1791 *
1792 * tty pointer to tty information structure
1793 * from_user flag: 1 = from user process
1794 * buf pointer to buffer containing send data
1795 * count size of send data in bytes
1796 *
1797 * Returns: number of characters written
1798 */
mgslpc_write(struct tty_struct * tty,int from_user,const unsigned char * buf,int count)1799 static int mgslpc_write(struct tty_struct * tty, int from_user,
1800 const unsigned char *buf, int count)
1801 {
1802 int c, ret = 0, err;
1803 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1804 unsigned long flags;
1805
1806 if (debug_level >= DEBUG_LEVEL_INFO)
1807 printk( "%s(%d):mgslpc_write(%s) count=%d\n",
1808 __FILE__,__LINE__,info->device_name,count);
1809
1810 if (mgslpc_paranoia_check(info, tty->device, "mgslpc_write") ||
1811 !tty || !info->tx_buf)
1812 goto cleanup;
1813
1814 if (info->params.mode == MGSL_MODE_HDLC) {
1815 if (count > TXBUFSIZE) {
1816 ret = -EIO;
1817 goto cleanup;
1818 }
1819 if (info->tx_active)
1820 goto cleanup;
1821 else if (info->tx_count)
1822 goto start;
1823 }
1824
1825 for (;;) {
1826 c = MIN(count,
1827 MIN(TXBUFSIZE - info->tx_count - 1,
1828 TXBUFSIZE - info->tx_put));
1829 if (c <= 0)
1830 break;
1831
1832 if (from_user) {
1833 COPY_FROM_USER(err, info->tx_buf + info->tx_put, buf, c);
1834 if (err) {
1835 if (!ret)
1836 ret = -EFAULT;
1837 break;
1838 }
1839 } else
1840 memcpy(info->tx_buf + info->tx_put, buf, c);
1841
1842 spin_lock_irqsave(&info->lock,flags);
1843 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1844 info->tx_count += c;
1845 spin_unlock_irqrestore(&info->lock,flags);
1846
1847 buf += c;
1848 count -= c;
1849 ret += c;
1850 }
1851 start:
1852 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1853 spin_lock_irqsave(&info->lock,flags);
1854 if (!info->tx_active)
1855 tx_start(info);
1856 spin_unlock_irqrestore(&info->lock,flags);
1857 }
1858 cleanup:
1859 if (debug_level >= DEBUG_LEVEL_INFO)
1860 printk( "%s(%d):mgslpc_write(%s) returning=%d\n",
1861 __FILE__,__LINE__,info->device_name,ret);
1862 return ret;
1863 }
1864
1865 /* Return the count of free bytes in transmit buffer
1866 */
mgslpc_write_room(struct tty_struct * tty)1867 static int mgslpc_write_room(struct tty_struct *tty)
1868 {
1869 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1870 int ret;
1871
1872 if (mgslpc_paranoia_check(info, tty->device, "mgslpc_write_room"))
1873 return 0;
1874
1875 if (info->params.mode == MGSL_MODE_HDLC) {
1876 /* HDLC (frame oriented) mode */
1877 if (info->tx_active)
1878 return 0;
1879 else
1880 return HDLC_MAX_FRAME_SIZE;
1881 } else {
1882 ret = TXBUFSIZE - info->tx_count - 1;
1883 if (ret < 0)
1884 ret = 0;
1885 }
1886
1887 if (debug_level >= DEBUG_LEVEL_INFO)
1888 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1889 __FILE__,__LINE__, info->device_name, ret);
1890 return ret;
1891 }
1892
1893 /* Return the count of bytes in transmit buffer
1894 */
mgslpc_chars_in_buffer(struct tty_struct * tty)1895 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1896 {
1897 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1898 int rc;
1899
1900 if (debug_level >= DEBUG_LEVEL_INFO)
1901 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1902 __FILE__,__LINE__, info->device_name );
1903
1904 if (mgslpc_paranoia_check(info, tty->device, "mgslpc_chars_in_buffer"))
1905 return 0;
1906
1907 if (info->params.mode == MGSL_MODE_HDLC)
1908 rc = info->tx_active ? info->max_frame_size : 0;
1909 else
1910 rc = info->tx_count;
1911
1912 if (debug_level >= DEBUG_LEVEL_INFO)
1913 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1914 __FILE__,__LINE__, info->device_name, rc);
1915
1916 return rc;
1917 }
1918
1919 /* Discard all data in the send buffer
1920 */
mgslpc_flush_buffer(struct tty_struct * tty)1921 static void mgslpc_flush_buffer(struct tty_struct *tty)
1922 {
1923 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1924 unsigned long flags;
1925
1926 if (debug_level >= DEBUG_LEVEL_INFO)
1927 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1928 __FILE__,__LINE__, info->device_name );
1929
1930 if (mgslpc_paranoia_check(info, tty->device, "mgslpc_flush_buffer"))
1931 return;
1932
1933 spin_lock_irqsave(&info->lock,flags);
1934 info->tx_count = info->tx_put = info->tx_get = 0;
1935 del_timer(&info->tx_timer);
1936 spin_unlock_irqrestore(&info->lock,flags);
1937
1938 wake_up_interruptible(&tty->write_wait);
1939 tty_wakeup(tty);
1940 }
1941
1942 /* Send a high-priority XON/XOFF character
1943 */
mgslpc_send_xchar(struct tty_struct * tty,char ch)1944 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1945 {
1946 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1947 unsigned long flags;
1948
1949 if (debug_level >= DEBUG_LEVEL_INFO)
1950 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1951 __FILE__,__LINE__, info->device_name, ch );
1952
1953 if (mgslpc_paranoia_check(info, tty->device, "mgslpc_send_xchar"))
1954 return;
1955
1956 info->x_char = ch;
1957 if (ch) {
1958 spin_lock_irqsave(&info->lock,flags);
1959 if (!info->tx_enabled)
1960 tx_start(info);
1961 spin_unlock_irqrestore(&info->lock,flags);
1962 }
1963 }
1964
1965 /* Signal remote device to throttle send data (our receive data)
1966 */
mgslpc_throttle(struct tty_struct * tty)1967 static void mgslpc_throttle(struct tty_struct * tty)
1968 {
1969 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1970 unsigned long flags;
1971
1972 if (debug_level >= DEBUG_LEVEL_INFO)
1973 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1974 __FILE__,__LINE__, info->device_name );
1975
1976 if (mgslpc_paranoia_check(info, tty->device, "mgslpc_throttle"))
1977 return;
1978
1979 if (I_IXOFF(tty))
1980 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1981
1982 if (tty->termios->c_cflag & CRTSCTS) {
1983 spin_lock_irqsave(&info->lock,flags);
1984 info->serial_signals &= ~SerialSignal_RTS;
1985 set_signals(info);
1986 spin_unlock_irqrestore(&info->lock,flags);
1987 }
1988 }
1989
1990 /* Signal remote device to stop throttling send data (our receive data)
1991 */
mgslpc_unthrottle(struct tty_struct * tty)1992 static void mgslpc_unthrottle(struct tty_struct * tty)
1993 {
1994 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1995 unsigned long flags;
1996
1997 if (debug_level >= DEBUG_LEVEL_INFO)
1998 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1999 __FILE__,__LINE__, info->device_name );
2000
2001 if (mgslpc_paranoia_check(info, tty->device, "mgslpc_unthrottle"))
2002 return;
2003
2004 if (I_IXOFF(tty)) {
2005 if (info->x_char)
2006 info->x_char = 0;
2007 else
2008 mgslpc_send_xchar(tty, START_CHAR(tty));
2009 }
2010
2011 if (tty->termios->c_cflag & CRTSCTS) {
2012 spin_lock_irqsave(&info->lock,flags);
2013 info->serial_signals |= SerialSignal_RTS;
2014 set_signals(info);
2015 spin_unlock_irqrestore(&info->lock,flags);
2016 }
2017 }
2018
2019 /* get the current serial statistics
2020 */
get_stats(MGSLPC_INFO * info,struct mgsl_icount * user_icount)2021 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount *user_icount)
2022 {
2023 int err;
2024 if (debug_level >= DEBUG_LEVEL_INFO)
2025 printk("get_params(%s)\n", info->device_name);
2026 COPY_TO_USER(err,user_icount, &info->icount, sizeof(struct mgsl_icount));
2027 if (err)
2028 return -EFAULT;
2029 return 0;
2030 }
2031
2032 /* get the current serial parameters
2033 */
get_params(MGSLPC_INFO * info,MGSL_PARAMS * user_params)2034 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS *user_params)
2035 {
2036 int err;
2037 if (debug_level >= DEBUG_LEVEL_INFO)
2038 printk("get_params(%s)\n", info->device_name);
2039 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2040 if (err)
2041 return -EFAULT;
2042 return 0;
2043 }
2044
2045 /* set the serial parameters
2046 *
2047 * Arguments:
2048 *
2049 * info pointer to device instance data
2050 * new_params user buffer containing new serial params
2051 *
2052 * Returns: 0 if success, otherwise error code
2053 */
set_params(MGSLPC_INFO * info,MGSL_PARAMS * new_params)2054 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS *new_params)
2055 {
2056 unsigned long flags;
2057 MGSL_PARAMS tmp_params;
2058 int err;
2059
2060 if (debug_level >= DEBUG_LEVEL_INFO)
2061 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
2062 info->device_name );
2063 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2064 if (err) {
2065 if ( debug_level >= DEBUG_LEVEL_INFO )
2066 printk( "%s(%d):set_params(%s) user buffer copy failed\n",
2067 __FILE__,__LINE__,info->device_name);
2068 return -EFAULT;
2069 }
2070
2071 spin_lock_irqsave(&info->lock,flags);
2072 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2073 spin_unlock_irqrestore(&info->lock,flags);
2074
2075 mgslpc_change_params(info);
2076
2077 return 0;
2078 }
2079
get_txidle(MGSLPC_INFO * info,int * idle_mode)2080 static int get_txidle(MGSLPC_INFO * info, int*idle_mode)
2081 {
2082 int err;
2083 if (debug_level >= DEBUG_LEVEL_INFO)
2084 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
2085 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2086 if (err)
2087 return -EFAULT;
2088 return 0;
2089 }
2090
set_txidle(MGSLPC_INFO * info,int idle_mode)2091 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
2092 {
2093 unsigned long flags;
2094 if (debug_level >= DEBUG_LEVEL_INFO)
2095 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
2096 spin_lock_irqsave(&info->lock,flags);
2097 info->idle_mode = idle_mode;
2098 tx_set_idle(info);
2099 spin_unlock_irqrestore(&info->lock,flags);
2100 return 0;
2101 }
2102
get_interface(MGSLPC_INFO * info,int * if_mode)2103 static int get_interface(MGSLPC_INFO * info, int*if_mode)
2104 {
2105 int err;
2106 if (debug_level >= DEBUG_LEVEL_INFO)
2107 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
2108 COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
2109 if (err)
2110 return -EFAULT;
2111 return 0;
2112 }
2113
set_interface(MGSLPC_INFO * info,int if_mode)2114 static int set_interface(MGSLPC_INFO * info, int if_mode)
2115 {
2116 unsigned long flags;
2117 unsigned char val;
2118 if (debug_level >= DEBUG_LEVEL_INFO)
2119 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
2120 spin_lock_irqsave(&info->lock,flags);
2121 info->if_mode = if_mode;
2122
2123 val = read_reg(info, PVR) & 0x0f;
2124 switch (info->if_mode)
2125 {
2126 case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
2127 case MGSL_INTERFACE_V35: val |= PVR_V35; break;
2128 case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
2129 }
2130 write_reg(info, PVR, val);
2131
2132 spin_unlock_irqrestore(&info->lock,flags);
2133 return 0;
2134 }
2135
set_txenable(MGSLPC_INFO * info,int enable)2136 static int set_txenable(MGSLPC_INFO * info, int enable)
2137 {
2138 unsigned long flags;
2139
2140 if (debug_level >= DEBUG_LEVEL_INFO)
2141 printk("set_txenable(%s,%d)\n", info->device_name, enable);
2142
2143 spin_lock_irqsave(&info->lock,flags);
2144 if (enable) {
2145 if (!info->tx_enabled)
2146 tx_start(info);
2147 } else {
2148 if (info->tx_enabled)
2149 tx_stop(info);
2150 }
2151 spin_unlock_irqrestore(&info->lock,flags);
2152 return 0;
2153 }
2154
tx_abort(MGSLPC_INFO * info)2155 static int tx_abort(MGSLPC_INFO * info)
2156 {
2157 unsigned long flags;
2158
2159 if (debug_level >= DEBUG_LEVEL_INFO)
2160 printk("tx_abort(%s)\n", info->device_name);
2161
2162 spin_lock_irqsave(&info->lock,flags);
2163 if (info->tx_active && info->tx_count &&
2164 info->params.mode == MGSL_MODE_HDLC) {
2165 /* clear data count so FIFO is not filled on next IRQ.
2166 * This results in underrun and abort transmission.
2167 */
2168 info->tx_count = info->tx_put = info->tx_get = 0;
2169 info->tx_aborting = TRUE;
2170 }
2171 spin_unlock_irqrestore(&info->lock,flags);
2172 return 0;
2173 }
2174
set_rxenable(MGSLPC_INFO * info,int enable)2175 static int set_rxenable(MGSLPC_INFO * info, int enable)
2176 {
2177 unsigned long flags;
2178
2179 if (debug_level >= DEBUG_LEVEL_INFO)
2180 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
2181
2182 spin_lock_irqsave(&info->lock,flags);
2183 if (enable) {
2184 if (!info->rx_enabled)
2185 rx_start(info);
2186 } else {
2187 if (info->rx_enabled)
2188 rx_stop(info);
2189 }
2190 spin_unlock_irqrestore(&info->lock,flags);
2191 return 0;
2192 }
2193
2194 /* wait for specified event to occur
2195 *
2196 * Arguments: info pointer to device instance data
2197 * mask pointer to bitmask of events to wait for
2198 * Return Value: 0 if successful and bit mask updated with
2199 * of events triggerred,
2200 * otherwise error code
2201 */
wait_events(MGSLPC_INFO * info,int * mask_ptr)2202 static int wait_events(MGSLPC_INFO * info, int * mask_ptr)
2203 {
2204 unsigned long flags;
2205 int s;
2206 int rc=0;
2207 struct mgsl_icount cprev, cnow;
2208 int events;
2209 int mask;
2210 struct _input_signal_events oldsigs, newsigs;
2211 DECLARE_WAITQUEUE(wait, current);
2212
2213 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2214 if (rc)
2215 return -EFAULT;
2216
2217 if (debug_level >= DEBUG_LEVEL_INFO)
2218 printk("wait_events(%s,%d)\n", info->device_name, mask);
2219
2220 spin_lock_irqsave(&info->lock,flags);
2221
2222 /* return immediately if state matches requested events */
2223 get_signals(info);
2224 s = info->serial_signals;
2225 events = mask &
2226 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2227 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2228 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2229 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2230 if (events) {
2231 spin_unlock_irqrestore(&info->lock,flags);
2232 goto exit;
2233 }
2234
2235 /* save current irq counts */
2236 cprev = info->icount;
2237 oldsigs = info->input_signal_events;
2238
2239 if ((info->params.mode == MGSL_MODE_HDLC) &&
2240 (mask & MgslEvent_ExitHuntMode))
2241 irq_enable(info, CHA, IRQ_EXITHUNT);
2242
2243 set_current_state(TASK_INTERRUPTIBLE);
2244 add_wait_queue(&info->event_wait_q, &wait);
2245
2246 spin_unlock_irqrestore(&info->lock,flags);
2247
2248
2249 for(;;) {
2250 schedule();
2251 if (signal_pending(current)) {
2252 rc = -ERESTARTSYS;
2253 break;
2254 }
2255
2256 /* get current irq counts */
2257 spin_lock_irqsave(&info->lock,flags);
2258 cnow = info->icount;
2259 newsigs = info->input_signal_events;
2260 set_current_state(TASK_INTERRUPTIBLE);
2261 spin_unlock_irqrestore(&info->lock,flags);
2262
2263 /* if no change, wait aborted for some reason */
2264 if (newsigs.dsr_up == oldsigs.dsr_up &&
2265 newsigs.dsr_down == oldsigs.dsr_down &&
2266 newsigs.dcd_up == oldsigs.dcd_up &&
2267 newsigs.dcd_down == oldsigs.dcd_down &&
2268 newsigs.cts_up == oldsigs.cts_up &&
2269 newsigs.cts_down == oldsigs.cts_down &&
2270 newsigs.ri_up == oldsigs.ri_up &&
2271 newsigs.ri_down == oldsigs.ri_down &&
2272 cnow.exithunt == cprev.exithunt &&
2273 cnow.rxidle == cprev.rxidle) {
2274 rc = -EIO;
2275 break;
2276 }
2277
2278 events = mask &
2279 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2280 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2281 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2282 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2283 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2284 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2285 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2286 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2287 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2288 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2289 if (events)
2290 break;
2291
2292 cprev = cnow;
2293 oldsigs = newsigs;
2294 }
2295
2296 remove_wait_queue(&info->event_wait_q, &wait);
2297 set_current_state(TASK_RUNNING);
2298
2299 if (mask & MgslEvent_ExitHuntMode) {
2300 spin_lock_irqsave(&info->lock,flags);
2301 if (!waitqueue_active(&info->event_wait_q))
2302 irq_disable(info, CHA, IRQ_EXITHUNT);
2303 spin_unlock_irqrestore(&info->lock,flags);
2304 }
2305 exit:
2306 if (rc == 0)
2307 PUT_USER(rc, events, mask_ptr);
2308 return rc;
2309 }
2310
modem_input_wait(MGSLPC_INFO * info,int arg)2311 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2312 {
2313 unsigned long flags;
2314 int rc;
2315 struct mgsl_icount cprev, cnow;
2316 DECLARE_WAITQUEUE(wait, current);
2317
2318 /* save current irq counts */
2319 spin_lock_irqsave(&info->lock,flags);
2320 cprev = info->icount;
2321 add_wait_queue(&info->status_event_wait_q, &wait);
2322 set_current_state(TASK_INTERRUPTIBLE);
2323 spin_unlock_irqrestore(&info->lock,flags);
2324
2325 for(;;) {
2326 schedule();
2327 if (signal_pending(current)) {
2328 rc = -ERESTARTSYS;
2329 break;
2330 }
2331
2332 /* get new irq counts */
2333 spin_lock_irqsave(&info->lock,flags);
2334 cnow = info->icount;
2335 set_current_state(TASK_INTERRUPTIBLE);
2336 spin_unlock_irqrestore(&info->lock,flags);
2337
2338 /* if no change, wait aborted for some reason */
2339 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2340 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2341 rc = -EIO;
2342 break;
2343 }
2344
2345 /* check for change in caller specified modem input */
2346 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2347 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2348 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2349 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2350 rc = 0;
2351 break;
2352 }
2353
2354 cprev = cnow;
2355 }
2356 remove_wait_queue(&info->status_event_wait_q, &wait);
2357 set_current_state(TASK_RUNNING);
2358 return rc;
2359 }
2360
2361 /* Return state of the serial control/status signals
2362 *
2363 * Arguments: info pointer to device instance data
2364 * value pointer to int to hold returned info
2365 *
2366 * Return Value: 0 if success, otherwise error code
2367 */
get_modem_info(MGSLPC_INFO * info,unsigned int * value)2368 static int get_modem_info(MGSLPC_INFO * info, unsigned int *value)
2369 {
2370 unsigned int result;
2371 unsigned long flags;
2372 int err;
2373
2374 spin_lock_irqsave(&info->lock,flags);
2375 get_signals(info);
2376 spin_unlock_irqrestore(&info->lock,flags);
2377
2378 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) |
2379 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) |
2380 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) |
2381 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) |
2382 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) |
2383 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2384
2385 if (debug_level >= DEBUG_LEVEL_INFO)
2386 printk("mgslpc_get_modem_info %s value=%08X\n", info->device_name, result);
2387
2388 PUT_USER(err,result,value);
2389 return err ? -EFAULT : 0;
2390 }
2391
2392 /* Set the state of the modem control signals (DTR/RTS)
2393 *
2394 * Arguments:
2395 *
2396 * info pointer to device instance data
2397 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
2398 * TIOCMSET = set/clear signal values
2399 * value bit mask for command
2400 *
2401 * Return Value: 0 if success, otherwise error code
2402 */
set_modem_info(MGSLPC_INFO * info,unsigned int cmd,unsigned int * value)2403 static int set_modem_info(MGSLPC_INFO * info, unsigned int cmd,
2404 unsigned int *value)
2405 {
2406 int error;
2407 unsigned int arg;
2408 unsigned long flags;
2409
2410 if (debug_level >= DEBUG_LEVEL_INFO)
2411 printk("mgslpc_set_modem_info %s\n", info->device_name);
2412
2413 GET_USER(error,arg,value);
2414 if (error)
2415 return error;
2416
2417 switch (cmd) {
2418 case TIOCMBIS:
2419 if (arg & TIOCM_RTS)
2420 info->serial_signals |= SerialSignal_RTS;
2421 if (arg & TIOCM_DTR)
2422 info->serial_signals |= SerialSignal_DTR;
2423 break;
2424 case TIOCMBIC:
2425 if (arg & TIOCM_RTS)
2426 info->serial_signals &= ~SerialSignal_RTS;
2427 if (arg & TIOCM_DTR)
2428 info->serial_signals &= ~SerialSignal_DTR;
2429 break;
2430 case TIOCMSET:
2431 if (arg & TIOCM_RTS)
2432 info->serial_signals |= SerialSignal_RTS;
2433 else
2434 info->serial_signals &= ~SerialSignal_RTS;
2435
2436 if (arg & TIOCM_DTR)
2437 info->serial_signals |= SerialSignal_DTR;
2438 else
2439 info->serial_signals &= ~SerialSignal_DTR;
2440 break;
2441 default:
2442 return -EINVAL;
2443 }
2444
2445 spin_lock_irqsave(&info->lock,flags);
2446 set_signals(info);
2447 spin_unlock_irqrestore(&info->lock,flags);
2448
2449 return 0;
2450 }
2451
2452 /* Set or clear transmit break condition
2453 *
2454 * Arguments: tty pointer to tty instance data
2455 * break_state -1=set break condition, 0=clear
2456 */
mgslpc_break(struct tty_struct * tty,int break_state)2457 static void mgslpc_break(struct tty_struct *tty, int break_state)
2458 {
2459 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2460 unsigned long flags;
2461
2462 if (debug_level >= DEBUG_LEVEL_INFO)
2463 printk("%s(%d):mgslpc_break(%s,%d)\n",
2464 __FILE__,__LINE__, info->device_name, break_state);
2465
2466 if (mgslpc_paranoia_check(info, tty->device, "mgslpc_break"))
2467 return;
2468
2469 spin_lock_irqsave(&info->lock,flags);
2470 if (break_state == -1)
2471 set_reg_bits(info, CHA+DAFO, BIT6);
2472 else
2473 clear_reg_bits(info, CHA+DAFO, BIT6);
2474 spin_unlock_irqrestore(&info->lock,flags);
2475 }
2476
2477 /* Service an IOCTL request
2478 *
2479 * Arguments:
2480 *
2481 * tty pointer to tty instance data
2482 * file pointer to associated file object for device
2483 * cmd IOCTL command code
2484 * arg command argument/context
2485 *
2486 * Return Value: 0 if success, otherwise error code
2487 */
mgslpc_ioctl(struct tty_struct * tty,struct file * file,unsigned int cmd,unsigned long arg)2488 static int mgslpc_ioctl(struct tty_struct *tty, struct file * file,
2489 unsigned int cmd, unsigned long arg)
2490 {
2491 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2492
2493 if (debug_level >= DEBUG_LEVEL_INFO)
2494 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2495 info->device_name, cmd );
2496
2497 if (mgslpc_paranoia_check(info, tty->device, "mgslpc_ioctl"))
2498 return -ENODEV;
2499
2500 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2501 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2502 if (tty->flags & (1 << TTY_IO_ERROR))
2503 return -EIO;
2504 }
2505
2506 return ioctl_common(info, cmd, arg);
2507 }
2508
ioctl_common(MGSLPC_INFO * info,unsigned int cmd,unsigned long arg)2509 int ioctl_common(MGSLPC_INFO *info, unsigned int cmd, unsigned long arg)
2510 {
2511 int error;
2512 struct mgsl_icount cnow; /* kernel counter temps */
2513 struct serial_icounter_struct *p_cuser; /* user space */
2514 unsigned long flags;
2515
2516 switch (cmd) {
2517 case TIOCMGET:
2518 return get_modem_info(info, (unsigned int *) arg);
2519 case TIOCMBIS:
2520 case TIOCMBIC:
2521 case TIOCMSET:
2522 return set_modem_info(info, cmd, (unsigned int *) arg);
2523 case MGSL_IOCGPARAMS:
2524 return get_params(info,(MGSL_PARAMS *)arg);
2525 case MGSL_IOCSPARAMS:
2526 return set_params(info,(MGSL_PARAMS *)arg);
2527 case MGSL_IOCGTXIDLE:
2528 return get_txidle(info,(int*)arg);
2529 case MGSL_IOCSTXIDLE:
2530 return set_txidle(info,(int)arg);
2531 case MGSL_IOCGIF:
2532 return get_interface(info,(int*)arg);
2533 case MGSL_IOCSIF:
2534 return set_interface(info,(int)arg);
2535 case MGSL_IOCTXENABLE:
2536 return set_txenable(info,(int)arg);
2537 case MGSL_IOCRXENABLE:
2538 return set_rxenable(info,(int)arg);
2539 case MGSL_IOCTXABORT:
2540 return tx_abort(info);
2541 case MGSL_IOCGSTATS:
2542 return get_stats(info,(struct mgsl_icount*)arg);
2543 case MGSL_IOCWAITEVENT:
2544 return wait_events(info,(int*)arg);
2545 case MGSL_IOCCLRMODCOUNT:
2546 while(MOD_IN_USE)
2547 MOD_DEC_USE_COUNT;
2548 return 0;
2549 case TIOCMIWAIT:
2550 return modem_input_wait(info,(int)arg);
2551 case TIOCGICOUNT:
2552 spin_lock_irqsave(&info->lock,flags);
2553 cnow = info->icount;
2554 spin_unlock_irqrestore(&info->lock,flags);
2555 p_cuser = (struct serial_icounter_struct *) arg;
2556 PUT_USER(error,cnow.cts, &p_cuser->cts);
2557 if (error) return error;
2558 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
2559 if (error) return error;
2560 PUT_USER(error,cnow.rng, &p_cuser->rng);
2561 if (error) return error;
2562 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
2563 if (error) return error;
2564 PUT_USER(error,cnow.rx, &p_cuser->rx);
2565 if (error) return error;
2566 PUT_USER(error,cnow.tx, &p_cuser->tx);
2567 if (error) return error;
2568 PUT_USER(error,cnow.frame, &p_cuser->frame);
2569 if (error) return error;
2570 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
2571 if (error) return error;
2572 PUT_USER(error,cnow.parity, &p_cuser->parity);
2573 if (error) return error;
2574 PUT_USER(error,cnow.brk, &p_cuser->brk);
2575 if (error) return error;
2576 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
2577 if (error) return error;
2578 return 0;
2579 default:
2580 return -ENOIOCTLCMD;
2581 }
2582 return 0;
2583 }
2584
2585 /* Set new termios settings
2586 *
2587 * Arguments:
2588 *
2589 * tty pointer to tty structure
2590 * termios pointer to buffer to hold returned old termios
2591 */
mgslpc_set_termios(struct tty_struct * tty,struct termios * old_termios)2592 static void mgslpc_set_termios(struct tty_struct *tty, struct termios *old_termios)
2593 {
2594 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2595 unsigned long flags;
2596
2597 if (debug_level >= DEBUG_LEVEL_INFO)
2598 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__,__LINE__,
2599 tty->driver.name );
2600
2601 /* just return if nothing has changed */
2602 if ((tty->termios->c_cflag == old_termios->c_cflag)
2603 && (RELEVANT_IFLAG(tty->termios->c_iflag)
2604 == RELEVANT_IFLAG(old_termios->c_iflag)))
2605 return;
2606
2607 mgslpc_change_params(info);
2608
2609 /* Handle transition to B0 status */
2610 if (old_termios->c_cflag & CBAUD &&
2611 !(tty->termios->c_cflag & CBAUD)) {
2612 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2613 spin_lock_irqsave(&info->lock,flags);
2614 set_signals(info);
2615 spin_unlock_irqrestore(&info->lock,flags);
2616 }
2617
2618 /* Handle transition away from B0 status */
2619 if (!(old_termios->c_cflag & CBAUD) &&
2620 tty->termios->c_cflag & CBAUD) {
2621 info->serial_signals |= SerialSignal_DTR;
2622 if (!(tty->termios->c_cflag & CRTSCTS) ||
2623 !test_bit(TTY_THROTTLED, &tty->flags)) {
2624 info->serial_signals |= SerialSignal_RTS;
2625 }
2626 spin_lock_irqsave(&info->lock,flags);
2627 set_signals(info);
2628 spin_unlock_irqrestore(&info->lock,flags);
2629 }
2630
2631 /* Handle turning off CRTSCTS */
2632 if (old_termios->c_cflag & CRTSCTS &&
2633 !(tty->termios->c_cflag & CRTSCTS)) {
2634 tty->hw_stopped = 0;
2635 tx_release(tty);
2636 }
2637 }
2638
mgslpc_close(struct tty_struct * tty,struct file * filp)2639 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2640 {
2641 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2642
2643 if (mgslpc_paranoia_check(info, tty->device, "mgslpc_close"))
2644 return;
2645
2646 if (debug_level >= DEBUG_LEVEL_INFO)
2647 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2648 __FILE__,__LINE__, info->device_name, info->count);
2649
2650 if (!info->count)
2651 return;
2652
2653 if (tty_hung_up_p(filp))
2654 goto cleanup;
2655
2656 if ((tty->count == 1) && (info->count != 1)) {
2657 /*
2658 * tty->count is 1 and the tty structure will be freed.
2659 * info->count should be one in this case.
2660 * if it's not, correct it so that the port is shutdown.
2661 */
2662 printk("mgslpc_close: bad refcount; tty->count is 1, "
2663 "info->count is %d\n", info->count);
2664 info->count = 1;
2665 }
2666
2667 info->count--;
2668
2669 /* if at least one open remaining, leave hardware active */
2670 if (info->count)
2671 goto cleanup;
2672
2673 info->flags |= ASYNC_CLOSING;
2674
2675 /* Save the termios structure, since this port may have
2676 * separate termios for callout and dialin.
2677 */
2678 if (info->flags & ASYNC_NORMAL_ACTIVE)
2679 info->normal_termios = *tty->termios;
2680 if (info->flags & ASYNC_CALLOUT_ACTIVE)
2681 info->callout_termios = *tty->termios;
2682
2683 /* set tty->closing to notify line discipline to
2684 * only process XON/XOFF characters. Only the N_TTY
2685 * discipline appears to use this (ppp does not).
2686 */
2687 tty->closing = 1;
2688
2689 /* wait for transmit data to clear all layers */
2690
2691 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
2692 if (debug_level >= DEBUG_LEVEL_INFO)
2693 printk("%s(%d):mgslpc_close(%s) calling tty_wait_until_sent\n",
2694 __FILE__,__LINE__, info->device_name );
2695 tty_wait_until_sent(tty, info->closing_wait);
2696 }
2697
2698 if (info->flags & ASYNC_INITIALIZED)
2699 mgslpc_wait_until_sent(tty, info->timeout);
2700
2701 if (tty->driver.flush_buffer)
2702 tty->driver.flush_buffer(tty);
2703
2704 tty_ldisc_flush(tty);
2705
2706 shutdown(info);
2707
2708 tty->closing = 0;
2709 info->tty = 0;
2710
2711 if (info->blocked_open) {
2712 if (info->close_delay) {
2713 set_current_state(TASK_INTERRUPTIBLE);
2714 schedule_timeout(info->close_delay);
2715 }
2716 wake_up_interruptible(&info->open_wait);
2717 }
2718
2719 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
2720 ASYNC_CLOSING);
2721
2722 wake_up_interruptible(&info->close_wait);
2723
2724 cleanup:
2725 if (debug_level >= DEBUG_LEVEL_INFO)
2726 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__,__LINE__,
2727 tty->driver.name, info->count);
2728 if(MOD_IN_USE)
2729 MOD_DEC_USE_COUNT;
2730 }
2731
2732 /* Wait until the transmitter is empty.
2733 */
mgslpc_wait_until_sent(struct tty_struct * tty,int timeout)2734 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2735 {
2736 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2737 unsigned long orig_jiffies, char_time;
2738
2739 if (!info )
2740 return;
2741
2742 if (debug_level >= DEBUG_LEVEL_INFO)
2743 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2744 __FILE__,__LINE__, info->device_name );
2745
2746 if (mgslpc_paranoia_check(info, tty->device, "mgslpc_wait_until_sent"))
2747 return;
2748
2749 if (!(info->flags & ASYNC_INITIALIZED))
2750 goto exit;
2751
2752 orig_jiffies = jiffies;
2753
2754 /* Set check interval to 1/5 of estimated time to
2755 * send a character, and make it at least 1. The check
2756 * interval should also be less than the timeout.
2757 * Note: use tight timings here to satisfy the NIST-PCTS.
2758 */
2759
2760 if ( info->params.data_rate ) {
2761 char_time = info->timeout/(32 * 5);
2762 if (!char_time)
2763 char_time++;
2764 } else
2765 char_time = 1;
2766
2767 if (timeout)
2768 char_time = MIN(char_time, timeout);
2769
2770 if (info->params.mode == MGSL_MODE_HDLC) {
2771 while (info->tx_active) {
2772 set_current_state(TASK_INTERRUPTIBLE);
2773 schedule_timeout(char_time);
2774 if (signal_pending(current))
2775 break;
2776 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2777 break;
2778 }
2779 } else {
2780 while ((info->tx_count || info->tx_active) &&
2781 info->tx_enabled) {
2782 set_current_state(TASK_INTERRUPTIBLE);
2783 schedule_timeout(char_time);
2784 if (signal_pending(current))
2785 break;
2786 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2787 break;
2788 }
2789 }
2790
2791 exit:
2792 if (debug_level >= DEBUG_LEVEL_INFO)
2793 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2794 __FILE__,__LINE__, info->device_name );
2795 }
2796
2797 /* Called by tty_hangup() when a hangup is signaled.
2798 * This is the same as closing all open files for the port.
2799 */
mgslpc_hangup(struct tty_struct * tty)2800 static void mgslpc_hangup(struct tty_struct *tty)
2801 {
2802 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2803
2804 if (debug_level >= DEBUG_LEVEL_INFO)
2805 printk("%s(%d):mgslpc_hangup(%s)\n",
2806 __FILE__,__LINE__, info->device_name );
2807
2808 if (mgslpc_paranoia_check(info, tty->device, "mgslpc_hangup"))
2809 return;
2810
2811 mgslpc_flush_buffer(tty);
2812 shutdown(info);
2813
2814 info->count = 0;
2815 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
2816 info->tty = 0;
2817
2818 wake_up_interruptible(&info->open_wait);
2819 }
2820
2821 /* Block the current process until the specified port
2822 * is ready to be opened.
2823 */
block_til_ready(struct tty_struct * tty,struct file * filp,MGSLPC_INFO * info)2824 static int block_til_ready(struct tty_struct *tty, struct file *filp,
2825 MGSLPC_INFO *info)
2826 {
2827 DECLARE_WAITQUEUE(wait, current);
2828 int retval;
2829 int do_clocal = 0, extra_count = 0;
2830 unsigned long flags;
2831
2832 if (debug_level >= DEBUG_LEVEL_INFO)
2833 printk("%s(%d):block_til_ready on %s\n",
2834 __FILE__,__LINE__, tty->driver.name );
2835
2836 if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
2837 /* this is a callout device */
2838 /* just verify that normal device is not in use */
2839 if (info->flags & ASYNC_NORMAL_ACTIVE)
2840 return -EBUSY;
2841 if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
2842 (info->flags & ASYNC_SESSION_LOCKOUT) &&
2843 (info->session != current->session))
2844 return -EBUSY;
2845 if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
2846 (info->flags & ASYNC_PGRP_LOCKOUT) &&
2847 (info->pgrp != current->pgrp))
2848 return -EBUSY;
2849 info->flags |= ASYNC_CALLOUT_ACTIVE;
2850 return 0;
2851 }
2852
2853 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
2854 /* nonblock mode is set or port is not enabled */
2855 /* just verify that callout device is not active */
2856 if (info->flags & ASYNC_CALLOUT_ACTIVE)
2857 return -EBUSY;
2858 info->flags |= ASYNC_NORMAL_ACTIVE;
2859 return 0;
2860 }
2861
2862 if (info->flags & ASYNC_CALLOUT_ACTIVE) {
2863 if (info->normal_termios.c_cflag & CLOCAL)
2864 do_clocal = 1;
2865 } else {
2866 if (tty->termios->c_cflag & CLOCAL)
2867 do_clocal = 1;
2868 }
2869
2870 /* Wait for carrier detect and the line to become
2871 * free (i.e., not in use by the callout). While we are in
2872 * this loop, info->count is dropped by one, so that
2873 * mgslpc_close() knows when to free things. We restore it upon
2874 * exit, either normal or abnormal.
2875 */
2876
2877 retval = 0;
2878 add_wait_queue(&info->open_wait, &wait);
2879
2880 if (debug_level >= DEBUG_LEVEL_INFO)
2881 printk("%s(%d):block_til_ready before block on %s count=%d\n",
2882 __FILE__,__LINE__, tty->driver.name, info->count );
2883
2884 save_flags(flags); cli();
2885 if (!tty_hung_up_p(filp)) {
2886 extra_count = 1;
2887 info->count--;
2888 }
2889 restore_flags(flags);
2890 info->blocked_open++;
2891
2892 while (1) {
2893 if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
2894 (tty->termios->c_cflag & CBAUD)) {
2895 spin_lock_irqsave(&info->lock,flags);
2896 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2897 set_signals(info);
2898 spin_unlock_irqrestore(&info->lock,flags);
2899 }
2900
2901 set_current_state(TASK_INTERRUPTIBLE);
2902
2903 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
2904 retval = (info->flags & ASYNC_HUP_NOTIFY) ?
2905 -EAGAIN : -ERESTARTSYS;
2906 break;
2907 }
2908
2909 spin_lock_irqsave(&info->lock,flags);
2910 get_signals(info);
2911 spin_unlock_irqrestore(&info->lock,flags);
2912
2913 if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
2914 !(info->flags & ASYNC_CLOSING) &&
2915 (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
2916 break;
2917 }
2918
2919 if (signal_pending(current)) {
2920 retval = -ERESTARTSYS;
2921 break;
2922 }
2923
2924 if (debug_level >= DEBUG_LEVEL_INFO)
2925 printk("%s(%d):block_til_ready blocking on %s count=%d\n",
2926 __FILE__,__LINE__, tty->driver.name, info->count );
2927
2928 schedule();
2929 }
2930
2931 set_current_state(TASK_RUNNING);
2932 remove_wait_queue(&info->open_wait, &wait);
2933
2934 if (extra_count)
2935 info->count++;
2936 info->blocked_open--;
2937
2938 if (debug_level >= DEBUG_LEVEL_INFO)
2939 printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
2940 __FILE__,__LINE__, tty->driver.name, info->count );
2941
2942 if (!retval)
2943 info->flags |= ASYNC_NORMAL_ACTIVE;
2944
2945 return retval;
2946 }
2947
mgslpc_open(struct tty_struct * tty,struct file * filp)2948 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2949 {
2950 MGSLPC_INFO *info;
2951 int retval, line;
2952 unsigned long flags;
2953
2954 /* verify range of specified line number */
2955 line = MINOR(tty->device) - tty->driver.minor_start;
2956 if ((line < 0) || (line >= mgslpc_device_count)) {
2957 printk("%s(%d):mgslpc_open with illegal line #%d.\n",
2958 __FILE__,__LINE__,line);
2959 return -ENODEV;
2960 }
2961
2962 /* find the info structure for the specified line */
2963 info = mgslpc_device_list;
2964 while(info && info->line != line)
2965 info = info->next_device;
2966 if (mgslpc_paranoia_check(info, tty->device, "mgslpc_open"))
2967 return -ENODEV;
2968
2969 tty->driver_data = info;
2970 info->tty = tty;
2971
2972 if (debug_level >= DEBUG_LEVEL_INFO)
2973 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2974 __FILE__,__LINE__,tty->driver.name, info->count);
2975
2976 MOD_INC_USE_COUNT;
2977
2978 /* If port is closing, signal caller to try again */
2979 if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
2980 if (info->flags & ASYNC_CLOSING)
2981 interruptible_sleep_on(&info->close_wait);
2982 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
2983 -EAGAIN : -ERESTARTSYS);
2984 goto cleanup;
2985 }
2986
2987 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2988
2989 spin_lock_irqsave(&info->netlock, flags);
2990 if (info->netcount) {
2991 retval = -EBUSY;
2992 spin_unlock_irqrestore(&info->netlock, flags);
2993 goto cleanup;
2994 }
2995 info->count++;
2996 spin_unlock_irqrestore(&info->netlock, flags);
2997
2998 if (info->count == 1) {
2999 /* 1st open on this device, init hardware */
3000 retval = startup(info);
3001 if (retval < 0)
3002 goto cleanup;
3003 }
3004
3005 retval = block_til_ready(tty, filp, info);
3006 if (retval) {
3007 if (debug_level >= DEBUG_LEVEL_INFO)
3008 printk("%s(%d):block_til_ready(%s) returned %d\n",
3009 __FILE__,__LINE__, info->device_name, retval);
3010 goto cleanup;
3011 }
3012
3013 if ((info->count == 1) &&
3014 info->flags & ASYNC_SPLIT_TERMIOS) {
3015 if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
3016 *tty->termios = info->normal_termios;
3017 else
3018 *tty->termios = info->callout_termios;
3019 mgslpc_change_params(info);
3020 }
3021
3022 info->session = current->session;
3023 info->pgrp = current->pgrp;
3024
3025 if (debug_level >= DEBUG_LEVEL_INFO)
3026 printk("%s(%d):mgslpc_open(%s) success\n",
3027 __FILE__,__LINE__, info->device_name);
3028 retval = 0;
3029
3030 cleanup:
3031 if (retval) {
3032 if (tty->count == 1)
3033 info->tty = 0; /* tty layer will release tty struct */
3034 if(MOD_IN_USE)
3035 MOD_DEC_USE_COUNT;
3036 if(info->count)
3037 info->count--;
3038 }
3039
3040 return retval;
3041 }
3042
3043 /*
3044 * /proc fs routines....
3045 */
3046
line_info(char * buf,MGSLPC_INFO * info)3047 static inline int line_info(char *buf, MGSLPC_INFO *info)
3048 {
3049 char stat_buf[30];
3050 int ret;
3051 unsigned long flags;
3052
3053 ret = sprintf(buf, "%s:io:%04X irq:%d",
3054 info->device_name, info->io_base, info->irq_level);
3055
3056 /* output current serial signal states */
3057 spin_lock_irqsave(&info->lock,flags);
3058 get_signals(info);
3059 spin_unlock_irqrestore(&info->lock,flags);
3060
3061 stat_buf[0] = 0;
3062 stat_buf[1] = 0;
3063 if (info->serial_signals & SerialSignal_RTS)
3064 strcat(stat_buf, "|RTS");
3065 if (info->serial_signals & SerialSignal_CTS)
3066 strcat(stat_buf, "|CTS");
3067 if (info->serial_signals & SerialSignal_DTR)
3068 strcat(stat_buf, "|DTR");
3069 if (info->serial_signals & SerialSignal_DSR)
3070 strcat(stat_buf, "|DSR");
3071 if (info->serial_signals & SerialSignal_DCD)
3072 strcat(stat_buf, "|CD");
3073 if (info->serial_signals & SerialSignal_RI)
3074 strcat(stat_buf, "|RI");
3075
3076 if (info->params.mode == MGSL_MODE_HDLC) {
3077 ret += sprintf(buf+ret, " HDLC txok:%d rxok:%d",
3078 info->icount.txok, info->icount.rxok);
3079 if (info->icount.txunder)
3080 ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
3081 if (info->icount.txabort)
3082 ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
3083 if (info->icount.rxshort)
3084 ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
3085 if (info->icount.rxlong)
3086 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
3087 if (info->icount.rxover)
3088 ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
3089 if (info->icount.rxcrc)
3090 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxcrc);
3091 } else {
3092 ret += sprintf(buf+ret, " ASYNC tx:%d rx:%d",
3093 info->icount.tx, info->icount.rx);
3094 if (info->icount.frame)
3095 ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
3096 if (info->icount.parity)
3097 ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
3098 if (info->icount.brk)
3099 ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
3100 if (info->icount.overrun)
3101 ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
3102 }
3103
3104 /* Append serial signal status to end */
3105 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
3106
3107 ret += sprintf(buf+ret, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
3108 info->tx_active,info->bh_requested,info->bh_running,
3109 info->pending_bh);
3110
3111 return ret;
3112 }
3113
3114 /* Called to print information about devices
3115 */
mgslpc_read_proc(char * page,char ** start,off_t off,int count,int * eof,void * data)3116 int mgslpc_read_proc(char *page, char **start, off_t off, int count,
3117 int *eof, void *data)
3118 {
3119 int len = 0, l;
3120 off_t begin = 0;
3121 MGSLPC_INFO *info;
3122
3123 len += sprintf(page, "synclink driver:%s\n", driver_version);
3124
3125 info = mgslpc_device_list;
3126 while( info ) {
3127 l = line_info(page + len, info);
3128 len += l;
3129 if (len+begin > off+count)
3130 goto done;
3131 if (len+begin < off) {
3132 begin += len;
3133 len = 0;
3134 }
3135 info = info->next_device;
3136 }
3137
3138 *eof = 1;
3139 done:
3140 if (off >= len+begin)
3141 return 0;
3142 *start = page + (off-begin);
3143 return ((count < begin+len-off) ? count : begin+len-off);
3144 }
3145
rx_alloc_buffers(MGSLPC_INFO * info)3146 int rx_alloc_buffers(MGSLPC_INFO *info)
3147 {
3148 /* each buffer has header and data */
3149 info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
3150
3151 /* calculate total allocation size for 8 buffers */
3152 info->rx_buf_total_size = info->rx_buf_size * 8;
3153
3154 /* limit total allocated memory */
3155 if (info->rx_buf_total_size > 0x10000)
3156 info->rx_buf_total_size = 0x10000;
3157
3158 /* calculate number of buffers */
3159 info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
3160
3161 info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
3162 if (info->rx_buf == NULL)
3163 return -ENOMEM;
3164
3165 rx_reset_buffers(info);
3166 return 0;
3167 }
3168
rx_free_buffers(MGSLPC_INFO * info)3169 void rx_free_buffers(MGSLPC_INFO *info)
3170 {
3171 if (info->rx_buf)
3172 kfree(info->rx_buf);
3173 info->rx_buf = NULL;
3174 }
3175
claim_resources(MGSLPC_INFO * info)3176 int claim_resources(MGSLPC_INFO *info)
3177 {
3178 if (rx_alloc_buffers(info) < 0 ) {
3179 printk( "Cant allocate rx buffer %s\n", info->device_name);
3180 release_resources(info);
3181 return -ENODEV;
3182 }
3183 return 0;
3184 }
3185
release_resources(MGSLPC_INFO * info)3186 void release_resources(MGSLPC_INFO *info)
3187 {
3188 if (debug_level >= DEBUG_LEVEL_INFO)
3189 printk("release_resources(%s)\n", info->device_name);
3190 rx_free_buffers(info);
3191 }
3192
3193 /* Add the specified device instance data structure to the
3194 * global linked list of devices and increment the device count.
3195 *
3196 * Arguments: info pointer to device instance data
3197 */
mgslpc_add_device(MGSLPC_INFO * info)3198 void mgslpc_add_device(MGSLPC_INFO *info)
3199 {
3200 info->next_device = NULL;
3201 info->line = mgslpc_device_count;
3202 sprintf(info->device_name,"ttySLP%d",info->line);
3203
3204 if (info->line < MAX_DEVICE_COUNT) {
3205 if (maxframe[info->line])
3206 info->max_frame_size = maxframe[info->line];
3207 info->dosyncppp = dosyncppp[info->line];
3208 }
3209
3210 mgslpc_device_count++;
3211
3212 if (!mgslpc_device_list)
3213 mgslpc_device_list = info;
3214 else {
3215 MGSLPC_INFO *current_dev = mgslpc_device_list;
3216 while( current_dev->next_device )
3217 current_dev = current_dev->next_device;
3218 current_dev->next_device = info;
3219 }
3220
3221 if (info->max_frame_size < 4096)
3222 info->max_frame_size = 4096;
3223 else if (info->max_frame_size > 65535)
3224 info->max_frame_size = 65535;
3225
3226 printk( "SyncLink PC Card %s:IO=%04X IRQ=%d\n",
3227 info->device_name, info->io_base, info->irq_level);
3228
3229
3230 #ifdef CONFIG_SYNCLINK_SYNCPPP
3231 #ifdef MODULE
3232 if (info->dosyncppp)
3233 #endif
3234 mgslpc_sppp_init(info);
3235 #endif
3236 }
3237
mgslpc_remove_device(MGSLPC_INFO * remove_info)3238 void mgslpc_remove_device(MGSLPC_INFO *remove_info)
3239 {
3240 MGSLPC_INFO *info = mgslpc_device_list;
3241 MGSLPC_INFO *last = NULL;
3242
3243 while(info) {
3244 if (info == remove_info) {
3245 if (last)
3246 last->next_device = info->next_device;
3247 else
3248 mgslpc_device_list = info->next_device;
3249 #ifdef CONFIG_SYNCLINK_SYNCPPP
3250 if (info->dosyncppp)
3251 mgslpc_sppp_delete(info);
3252 #endif
3253 release_resources(info);
3254 kfree(info);
3255 mgslpc_device_count--;
3256 return;
3257 }
3258 last = info;
3259 info = info->next_device;
3260 }
3261 }
3262
synclink_cs_init(void)3263 static int __init synclink_cs_init(void)
3264 {
3265 servinfo_t serv;
3266
3267 EXPORT_NO_SYMBOLS;
3268
3269 if (break_on_load) {
3270 mgslpc_get_text_ptr();
3271 BREAKPOINT();
3272 }
3273
3274 printk("%s %s\n", driver_name, driver_version);
3275
3276 CardServices(GetCardServicesInfo, &serv);
3277 if (serv.Revision != CS_RELEASE_CODE) {
3278 printk(KERN_NOTICE "synclink_cs: Card Services release "
3279 "does not match!\n");
3280 return -1;
3281 }
3282 register_pccard_driver(&dev_info, &mgslpc_attach, &mgslpc_detach);
3283
3284 /* Initialize the tty_driver structure */
3285
3286 memset(&serial_driver, 0, sizeof(struct tty_driver));
3287 serial_driver.magic = TTY_DRIVER_MAGIC;
3288 serial_driver.driver_name = "synclink_cs";
3289 serial_driver.name = "ttySLP";
3290 serial_driver.major = ttymajor;
3291 serial_driver.minor_start = 64;
3292 serial_driver.num = MAX_DEVICE_COUNT;
3293 serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
3294 serial_driver.subtype = SERIAL_TYPE_NORMAL;
3295 serial_driver.init_termios = tty_std_termios;
3296 serial_driver.init_termios.c_cflag =
3297 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3298 serial_driver.flags = TTY_DRIVER_REAL_RAW;
3299 serial_driver.refcount = &serial_refcount;
3300 serial_driver.table = serial_table;
3301 serial_driver.termios = serial_termios;
3302 serial_driver.termios_locked = serial_termios_locked;
3303
3304 serial_driver.open = mgslpc_open;
3305 serial_driver.close = mgslpc_close;
3306 serial_driver.write = mgslpc_write;
3307 serial_driver.put_char = mgslpc_put_char;
3308 serial_driver.flush_chars = mgslpc_flush_chars;
3309 serial_driver.write_room = mgslpc_write_room;
3310 serial_driver.chars_in_buffer = mgslpc_chars_in_buffer;
3311 serial_driver.flush_buffer = mgslpc_flush_buffer;
3312 serial_driver.ioctl = mgslpc_ioctl;
3313 serial_driver.throttle = mgslpc_throttle;
3314 serial_driver.unthrottle = mgslpc_unthrottle;
3315 serial_driver.send_xchar = mgslpc_send_xchar;
3316 serial_driver.break_ctl = mgslpc_break;
3317 serial_driver.wait_until_sent = mgslpc_wait_until_sent;
3318 serial_driver.read_proc = mgslpc_read_proc;
3319 serial_driver.set_termios = mgslpc_set_termios;
3320 serial_driver.stop = tx_pause;
3321 serial_driver.start = tx_release;
3322 serial_driver.hangup = mgslpc_hangup;
3323
3324 /*
3325 * The callout device is just like normal device except for
3326 * major number and the subtype code.
3327 */
3328 callout_driver = serial_driver;
3329 callout_driver.name = "cuaSLP";
3330 callout_driver.major = cuamajor;
3331 callout_driver.subtype = SERIAL_TYPE_CALLOUT;
3332 callout_driver.read_proc = 0;
3333 callout_driver.proc_entry = 0;
3334
3335 if (tty_register_driver(&serial_driver) < 0)
3336 printk("%s(%d):Couldn't register serial driver\n",
3337 __FILE__,__LINE__);
3338
3339 if (tty_register_driver(&callout_driver) < 0)
3340 printk("%s(%d):Couldn't register callout driver\n",
3341 __FILE__,__LINE__);
3342
3343 printk("%s %s, tty major#%d callout major#%d\n",
3344 driver_name, driver_version,
3345 serial_driver.major, callout_driver.major);
3346
3347 return 0;
3348 }
3349
synclink_cs_exit(void)3350 static void __exit synclink_cs_exit(void)
3351 {
3352 unsigned long flags;
3353 int rc;
3354
3355 printk("Unloading %s: version %s\n", driver_name, driver_version);
3356
3357 while(mgslpc_device_list)
3358 mgslpc_remove_device(mgslpc_device_list);
3359
3360 save_flags(flags);
3361 cli();
3362 if ((rc = tty_unregister_driver(&serial_driver)))
3363 printk("%s(%d) failed to unregister tty driver err=%d\n",
3364 __FILE__,__LINE__,rc);
3365 if ((rc = tty_unregister_driver(&callout_driver)))
3366 printk("%s(%d) failed to unregister callout driver err=%d\n",
3367 __FILE__,__LINE__,rc);
3368 restore_flags(flags);
3369
3370 unregister_pccard_driver(&dev_info);
3371 while (dev_list != NULL) {
3372 del_timer(&dev_list->release);
3373 if (dev_list->state & DEV_CONFIG)
3374 mgslpc_release((u_long)dev_list);
3375 mgslpc_detach(dev_list);
3376 }
3377 }
3378
3379 module_init(synclink_cs_init);
3380 module_exit(synclink_cs_exit);
3381
mgslpc_set_rate(MGSLPC_INFO * info,unsigned char channel,unsigned int rate)3382 void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
3383 {
3384 unsigned int M, N;
3385 unsigned char val;
3386
3387 /* note:standard BRG mode is broken in V3.2 chip
3388 * so enhanced mode is always used
3389 */
3390
3391 if (rate) {
3392 N = 3686400 / rate;
3393 if (!N)
3394 N = 1;
3395 N >>= 1;
3396 for (M = 1; N > 64 && M < 16; M++)
3397 N >>= 1;
3398 N--;
3399
3400 /* BGR[5..0] = N
3401 * BGR[9..6] = M
3402 * BGR[7..0] contained in BGR register
3403 * BGR[9..8] contained in CCR2[7..6]
3404 * divisor = (N+1)*2^M
3405 *
3406 * Note: M *must* not be zero (causes asymetric duty cycle)
3407 */
3408 write_reg(info, (unsigned char) (channel + BGR),
3409 (unsigned char) ((M << 6) + N));
3410 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
3411 val |= ((M << 4) & 0xc0);
3412 write_reg(info, (unsigned char) (channel + CCR2), val);
3413 }
3414 }
3415
3416 /* Enabled the AUX clock output at the specified frequency.
3417 */
enable_auxclk(MGSLPC_INFO * info)3418 void enable_auxclk(MGSLPC_INFO *info)
3419 {
3420 unsigned char val;
3421
3422 /* MODE
3423 *
3424 * 07..06 MDS[1..0] 10 = transparent HDLC mode
3425 * 05 ADM Address Mode, 0 = no addr recognition
3426 * 04 TMD Timer Mode, 0 = external
3427 * 03 RAC Receiver Active, 0 = inactive
3428 * 02 RTS 0=RTS active during xmit, 1=RTS always active
3429 * 01 TRS Timer Resolution, 1=512
3430 * 00 TLP Test Loop, 0 = no loop
3431 *
3432 * 1000 0010
3433 */
3434 val = 0x82;
3435
3436 /* channel B RTS is used to enable AUXCLK driver on SP505 */
3437 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3438 val |= BIT2;
3439 write_reg(info, CHB + MODE, val);
3440
3441 /* CCR0
3442 *
3443 * 07 PU Power Up, 1=active, 0=power down
3444 * 06 MCE Master Clock Enable, 1=enabled
3445 * 05 Reserved, 0
3446 * 04..02 SC[2..0] Encoding
3447 * 01..00 SM[1..0] Serial Mode, 00=HDLC
3448 *
3449 * 11000000
3450 */
3451 write_reg(info, CHB + CCR0, 0xc0);
3452
3453 /* CCR1
3454 *
3455 * 07 SFLG Shared Flag, 0 = disable shared flags
3456 * 06 GALP Go Active On Loop, 0 = not used
3457 * 05 GLP Go On Loop, 0 = not used
3458 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3459 * 03 ITF Interframe Time Fill, 0=mark, 1=flag
3460 * 02..00 CM[2..0] Clock Mode
3461 *
3462 * 0001 0111
3463 */
3464 write_reg(info, CHB + CCR1, 0x17);
3465
3466 /* CCR2 (Channel B)
3467 *
3468 * 07..06 BGR[9..8] Baud rate bits 9..8
3469 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3470 * 04 SSEL Clock source select, 1=submode b
3471 * 03 TOE 0=TxCLK is input, 1=TxCLK is output
3472 * 02 RWX Read/Write Exchange 0=disabled
3473 * 01 C32, CRC select, 0=CRC-16, 1=CRC-32
3474 * 00 DIV, data inversion 0=disabled, 1=enabled
3475 *
3476 * 0011 1000
3477 */
3478 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3479 write_reg(info, CHB + CCR2, 0x38);
3480 else
3481 write_reg(info, CHB + CCR2, 0x30);
3482
3483 /* CCR4
3484 *
3485 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3486 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3487 * 05 TST1 Test Pin, 0=normal operation
3488 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3489 * 03..02 Reserved, must be 0
3490 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes
3491 *
3492 * 0101 0000
3493 */
3494 write_reg(info, CHB + CCR4, 0x50);
3495
3496 /* if auxclk not enabled, set internal BRG so
3497 * CTS transitions can be detected (requires TxC)
3498 */
3499 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3500 mgslpc_set_rate(info, CHB, info->params.clock_speed);
3501 else
3502 mgslpc_set_rate(info, CHB, 921600);
3503 }
3504
loopback_enable(MGSLPC_INFO * info)3505 static void loopback_enable(MGSLPC_INFO *info)
3506 {
3507 unsigned char val;
3508
3509 /* CCR1:02..00 CM[2..0] Clock Mode = 111 (clock mode 7) */
3510 val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
3511 write_reg(info, CHA + CCR1, val);
3512
3513 /* CCR2:04 SSEL Clock source select, 1=submode b */
3514 val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
3515 write_reg(info, CHA + CCR2, val);
3516
3517 /* set LinkSpeed if available, otherwise default to 2Mbps */
3518 if (info->params.clock_speed)
3519 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3520 else
3521 mgslpc_set_rate(info, CHA, 1843200);
3522
3523 /* MODE:00 TLP Test Loop, 1=loopback enabled */
3524 val = read_reg(info, CHA + MODE) | BIT0;
3525 write_reg(info, CHA + MODE, val);
3526 }
3527
hdlc_mode(MGSLPC_INFO * info)3528 void hdlc_mode(MGSLPC_INFO *info)
3529 {
3530 unsigned char val;
3531 unsigned char clkmode, clksubmode;
3532
3533 /* disable all interrupts */
3534 irq_disable(info, CHA, 0xffff);
3535 irq_disable(info, CHB, 0xffff);
3536 port_irq_disable(info, 0xff);
3537
3538 /* assume clock mode 0a, rcv=RxC xmt=TxC */
3539 clkmode = clksubmode = 0;
3540 if (info->params.flags & HDLC_FLAG_RXC_DPLL
3541 && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3542 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3543 clkmode = 7;
3544 } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3545 && info->params.flags & HDLC_FLAG_TXC_BRG) {
3546 /* clock mode 7b, rcv = BRG, xmt = BRG */
3547 clkmode = 7;
3548 clksubmode = 1;
3549 } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3550 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3551 /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3552 clkmode = 6;
3553 clksubmode = 1;
3554 } else {
3555 /* clock mode 6a, rcv = DPLL, xmt = TxC */
3556 clkmode = 6;
3557 }
3558 } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3559 /* clock mode 0b, rcv = RxC, xmt = BRG */
3560 clksubmode = 1;
3561 }
3562
3563 /* MODE
3564 *
3565 * 07..06 MDS[1..0] 10 = transparent HDLC mode
3566 * 05 ADM Address Mode, 0 = no addr recognition
3567 * 04 TMD Timer Mode, 0 = external
3568 * 03 RAC Receiver Active, 0 = inactive
3569 * 02 RTS 0=RTS active during xmit, 1=RTS always active
3570 * 01 TRS Timer Resolution, 1=512
3571 * 00 TLP Test Loop, 0 = no loop
3572 *
3573 * 1000 0010
3574 */
3575 val = 0x82;
3576 if (info->params.loopback)
3577 val |= BIT0;
3578
3579 /* preserve RTS state */
3580 if (info->serial_signals & SerialSignal_RTS)
3581 val |= BIT2;
3582 write_reg(info, CHA + MODE, val);
3583
3584 /* CCR0
3585 *
3586 * 07 PU Power Up, 1=active, 0=power down
3587 * 06 MCE Master Clock Enable, 1=enabled
3588 * 05 Reserved, 0
3589 * 04..02 SC[2..0] Encoding
3590 * 01..00 SM[1..0] Serial Mode, 00=HDLC
3591 *
3592 * 11000000
3593 */
3594 val = 0xc0;
3595 switch (info->params.encoding)
3596 {
3597 case HDLC_ENCODING_NRZI:
3598 val |= BIT3;
3599 break;
3600 case HDLC_ENCODING_BIPHASE_SPACE:
3601 val |= BIT4;
3602 break; // FM0
3603 case HDLC_ENCODING_BIPHASE_MARK:
3604 val |= BIT4 + BIT2;
3605 break; // FM1
3606 case HDLC_ENCODING_BIPHASE_LEVEL:
3607 val |= BIT4 + BIT3;
3608 break; // Manchester
3609 }
3610 write_reg(info, CHA + CCR0, val);
3611
3612 /* CCR1
3613 *
3614 * 07 SFLG Shared Flag, 0 = disable shared flags
3615 * 06 GALP Go Active On Loop, 0 = not used
3616 * 05 GLP Go On Loop, 0 = not used
3617 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3618 * 03 ITF Interframe Time Fill, 0=mark, 1=flag
3619 * 02..00 CM[2..0] Clock Mode
3620 *
3621 * 0001 0000
3622 */
3623 val = 0x10 + clkmode;
3624 write_reg(info, CHA + CCR1, val);
3625
3626 /* CCR2
3627 *
3628 * 07..06 BGR[9..8] Baud rate bits 9..8
3629 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3630 * 04 SSEL Clock source select, 1=submode b
3631 * 03 TOE 0=TxCLK is input, 0=TxCLK is input
3632 * 02 RWX Read/Write Exchange 0=disabled
3633 * 01 C32, CRC select, 0=CRC-16, 1=CRC-32
3634 * 00 DIV, data inversion 0=disabled, 1=enabled
3635 *
3636 * 0000 0000
3637 */
3638 val = 0x00;
3639 if (clkmode == 2 || clkmode == 3 || clkmode == 6
3640 || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3641 val |= BIT5;
3642 if (clksubmode)
3643 val |= BIT4;
3644 if (info->params.crc_type == HDLC_CRC_32_CCITT)
3645 val |= BIT1;
3646 if (info->params.encoding == HDLC_ENCODING_NRZB)
3647 val |= BIT0;
3648 write_reg(info, CHA + CCR2, val);
3649
3650 /* CCR3
3651 *
3652 * 07..06 PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3653 * 05 EPT Enable preamble transmission, 1=enabled
3654 * 04 RADD Receive address pushed to FIFO, 0=disabled
3655 * 03 CRL CRC Reset Level, 0=FFFF
3656 * 02 RCRC Rx CRC 0=On 1=Off
3657 * 01 TCRC Tx CRC 0=On 1=Off
3658 * 00 PSD DPLL Phase Shift Disable
3659 *
3660 * 0000 0000
3661 */
3662 val = 0x00;
3663 if (info->params.crc_type == HDLC_CRC_NONE)
3664 val |= BIT2 + BIT1;
3665 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3666 val |= BIT5;
3667 switch (info->params.preamble_length)
3668 {
3669 case HDLC_PREAMBLE_LENGTH_16BITS:
3670 val |= BIT6;
3671 break;
3672 case HDLC_PREAMBLE_LENGTH_32BITS:
3673 val |= BIT6;
3674 break;
3675 case HDLC_PREAMBLE_LENGTH_64BITS:
3676 val |= BIT7 + BIT6;
3677 break;
3678 }
3679 write_reg(info, CHA + CCR3, val);
3680
3681 /* PRE - Preamble pattern */
3682 val = 0;
3683 switch (info->params.preamble)
3684 {
3685 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3686 case HDLC_PREAMBLE_PATTERN_10: val = 0xaa; break;
3687 case HDLC_PREAMBLE_PATTERN_01: val = 0x55; break;
3688 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
3689 }
3690 write_reg(info, CHA + PRE, val);
3691
3692 /* CCR4
3693 *
3694 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3695 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3696 * 05 TST1 Test Pin, 0=normal operation
3697 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3698 * 03..02 Reserved, must be 0
3699 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes
3700 *
3701 * 0101 0000
3702 */
3703 val = 0x50;
3704 write_reg(info, CHA + CCR4, val);
3705 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3706 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3707 else
3708 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3709
3710 /* RLCR Receive length check register
3711 *
3712 * 7 1=enable receive length check
3713 * 6..0 Max frame length = (RL + 1) * 32
3714 */
3715 write_reg(info, CHA + RLCR, 0);
3716
3717 /* XBCH Transmit Byte Count High
3718 *
3719 * 07 DMA mode, 0 = interrupt driven
3720 * 06 NRM, 0=ABM (ignored)
3721 * 05 CAS Carrier Auto Start
3722 * 04 XC Transmit Continuously (ignored)
3723 * 03..00 XBC[10..8] Transmit byte count bits 10..8
3724 *
3725 * 0000 0000
3726 */
3727 val = 0x00;
3728 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3729 val |= BIT5;
3730 write_reg(info, CHA + XBCH, val);
3731 enable_auxclk(info);
3732 if (info->params.loopback || info->testing_irq)
3733 loopback_enable(info);
3734 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3735 {
3736 irq_enable(info, CHB, IRQ_CTS);
3737 /* PVR[3] 1=AUTO CTS active */
3738 set_reg_bits(info, CHA + PVR, BIT3);
3739 } else
3740 clear_reg_bits(info, CHA + PVR, BIT3);
3741
3742 irq_enable(info, CHA,
3743 IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
3744 IRQ_UNDERRUN + IRQ_TXFIFO);
3745 issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3746 wait_command_complete(info, CHA);
3747 read_reg16(info, CHA + ISR); /* clear pending IRQs */
3748
3749 /* Master clock mode enabled above to allow reset commands
3750 * to complete even if no data clocks are present.
3751 *
3752 * Disable master clock mode for normal communications because
3753 * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3754 * IRQ when in master clock mode.
3755 *
3756 * Leave master clock mode enabled for IRQ test because the
3757 * timer IRQ used by the test can only happen in master clock mode.
3758 */
3759 if (!info->testing_irq)
3760 clear_reg_bits(info, CHA + CCR0, BIT6);
3761
3762 tx_set_idle(info);
3763
3764 tx_stop(info);
3765 rx_stop(info);
3766 }
3767
rx_stop(MGSLPC_INFO * info)3768 void rx_stop(MGSLPC_INFO *info)
3769 {
3770 if (debug_level >= DEBUG_LEVEL_ISR)
3771 printk("%s(%d):rx_stop(%s)\n",
3772 __FILE__,__LINE__, info->device_name );
3773
3774 /* MODE:03 RAC Receiver Active, 0=inactive */
3775 clear_reg_bits(info, CHA + MODE, BIT3);
3776
3777 info->rx_enabled = 0;
3778 info->rx_overflow = 0;
3779 }
3780
rx_start(MGSLPC_INFO * info)3781 void rx_start(MGSLPC_INFO *info)
3782 {
3783 if (debug_level >= DEBUG_LEVEL_ISR)
3784 printk("%s(%d):rx_start(%s)\n",
3785 __FILE__,__LINE__, info->device_name );
3786
3787 rx_reset_buffers(info);
3788 info->rx_enabled = 0;
3789 info->rx_overflow = 0;
3790
3791 /* MODE:03 RAC Receiver Active, 1=active */
3792 set_reg_bits(info, CHA + MODE, BIT3);
3793
3794 info->rx_enabled = 1;
3795 }
3796
tx_start(MGSLPC_INFO * info)3797 void tx_start(MGSLPC_INFO *info)
3798 {
3799 if (debug_level >= DEBUG_LEVEL_ISR)
3800 printk("%s(%d):tx_start(%s)\n",
3801 __FILE__,__LINE__, info->device_name );
3802
3803 if (info->tx_count) {
3804 /* If auto RTS enabled and RTS is inactive, then assert */
3805 /* RTS and set a flag indicating that the driver should */
3806 /* negate RTS when the transmission completes. */
3807 info->drop_rts_on_tx_done = 0;
3808
3809 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3810 get_signals(info);
3811 if (!(info->serial_signals & SerialSignal_RTS)) {
3812 info->serial_signals |= SerialSignal_RTS;
3813 set_signals(info);
3814 info->drop_rts_on_tx_done = 1;
3815 }
3816 }
3817
3818 if (info->params.mode == MGSL_MODE_ASYNC) {
3819 if (!info->tx_active) {
3820 info->tx_active = 1;
3821 tx_ready(info);
3822 }
3823 } else {
3824 info->tx_active = 1;
3825 tx_ready(info);
3826 info->tx_timer.expires = jiffies + jiffies_from_ms(5000);
3827 add_timer(&info->tx_timer);
3828 }
3829 }
3830
3831 if (!info->tx_enabled)
3832 info->tx_enabled = 1;
3833 }
3834
tx_stop(MGSLPC_INFO * info)3835 void tx_stop(MGSLPC_INFO *info)
3836 {
3837 if (debug_level >= DEBUG_LEVEL_ISR)
3838 printk("%s(%d):tx_stop(%s)\n",
3839 __FILE__,__LINE__, info->device_name );
3840
3841 del_timer(&info->tx_timer);
3842
3843 info->tx_enabled = 0;
3844 info->tx_active = 0;
3845 }
3846
3847 /* Reset the adapter to a known state and prepare it for further use.
3848 */
reset_device(MGSLPC_INFO * info)3849 void reset_device(MGSLPC_INFO *info)
3850 {
3851 /* power up both channels (set BIT7) */
3852 write_reg(info, CHA + CCR0, 0x80);
3853 write_reg(info, CHB + CCR0, 0x80);
3854 write_reg(info, CHA + MODE, 0);
3855 write_reg(info, CHB + MODE, 0);
3856
3857 /* disable all interrupts */
3858 irq_disable(info, CHA, 0xffff);
3859 irq_disable(info, CHB, 0xffff);
3860 port_irq_disable(info, 0xff);
3861
3862 /* PCR Port Configuration Register
3863 *
3864 * 07..04 DEC[3..0] Serial I/F select outputs
3865 * 03 output, 1=AUTO CTS control enabled
3866 * 02 RI Ring Indicator input 0=active
3867 * 01 DSR input 0=active
3868 * 00 DTR output 0=active
3869 *
3870 * 0000 0110
3871 */
3872 write_reg(info, PCR, 0x06);
3873
3874 /* PVR Port Value Register
3875 *
3876 * 07..04 DEC[3..0] Serial I/F select (0000=disabled)
3877 * 03 AUTO CTS output 1=enabled
3878 * 02 RI Ring Indicator input
3879 * 01 DSR input
3880 * 00 DTR output (1=inactive)
3881 *
3882 * 0000 0001
3883 */
3884 // write_reg(info, PVR, PVR_DTR);
3885
3886 /* IPC Interrupt Port Configuration
3887 *
3888 * 07 VIS 1=Masked interrupts visible
3889 * 06..05 Reserved, 0
3890 * 04..03 SLA Slave address, 00 ignored
3891 * 02 CASM Cascading Mode, 1=daisy chain
3892 * 01..00 IC[1..0] Interrupt Config, 01=push-pull output, active low
3893 *
3894 * 0000 0101
3895 */
3896 write_reg(info, IPC, 0x05);
3897 }
3898
async_mode(MGSLPC_INFO * info)3899 void async_mode(MGSLPC_INFO *info)
3900 {
3901 unsigned char val;
3902
3903 /* disable all interrupts */
3904 irq_disable(info, CHA, 0xffff);
3905 irq_disable(info, CHB, 0xffff);
3906 port_irq_disable(info, 0xff);
3907
3908 /* MODE
3909 *
3910 * 07 Reserved, 0
3911 * 06 FRTS RTS State, 0=active
3912 * 05 FCTS Flow Control on CTS
3913 * 04 FLON Flow Control Enable
3914 * 03 RAC Receiver Active, 0 = inactive
3915 * 02 RTS 0=Auto RTS, 1=manual RTS
3916 * 01 TRS Timer Resolution, 1=512
3917 * 00 TLP Test Loop, 0 = no loop
3918 *
3919 * 0000 0110
3920 */
3921 val = 0x06;
3922 if (info->params.loopback)
3923 val |= BIT0;
3924
3925 /* preserve RTS state */
3926 if (!(info->serial_signals & SerialSignal_RTS))
3927 val |= BIT6;
3928 write_reg(info, CHA + MODE, val);
3929
3930 /* CCR0
3931 *
3932 * 07 PU Power Up, 1=active, 0=power down
3933 * 06 MCE Master Clock Enable, 1=enabled
3934 * 05 Reserved, 0
3935 * 04..02 SC[2..0] Encoding, 000=NRZ
3936 * 01..00 SM[1..0] Serial Mode, 11=Async
3937 *
3938 * 1000 0011
3939 */
3940 write_reg(info, CHA + CCR0, 0x83);
3941
3942 /* CCR1
3943 *
3944 * 07..05 Reserved, 0
3945 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3946 * 03 BCR Bit Clock Rate, 1=16x
3947 * 02..00 CM[2..0] Clock Mode, 111=BRG
3948 *
3949 * 0001 1111
3950 */
3951 write_reg(info, CHA + CCR1, 0x1f);
3952
3953 /* CCR2 (channel A)
3954 *
3955 * 07..06 BGR[9..8] Baud rate bits 9..8
3956 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3957 * 04 SSEL Clock source select, 1=submode b
3958 * 03 TOE 0=TxCLK is input, 0=TxCLK is input
3959 * 02 RWX Read/Write Exchange 0=disabled
3960 * 01 Reserved, 0
3961 * 00 DIV, data inversion 0=disabled, 1=enabled
3962 *
3963 * 0001 0000
3964 */
3965 write_reg(info, CHA + CCR2, 0x10);
3966
3967 /* CCR3
3968 *
3969 * 07..01 Reserved, 0
3970 * 00 PSD DPLL Phase Shift Disable
3971 *
3972 * 0000 0000
3973 */
3974 write_reg(info, CHA + CCR3, 0);
3975
3976 /* CCR4
3977 *
3978 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3979 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3980 * 05 TST1 Test Pin, 0=normal operation
3981 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3982 * 03..00 Reserved, must be 0
3983 *
3984 * 0101 0000
3985 */
3986 write_reg(info, CHA + CCR4, 0x50);
3987 mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3988
3989 /* DAFO Data Format
3990 *
3991 * 07 Reserved, 0
3992 * 06 XBRK transmit break, 0=normal operation
3993 * 05 Stop bits (0=1, 1=2)
3994 * 04..03 PAR[1..0] Parity (01=odd, 10=even)
3995 * 02 PAREN Parity Enable
3996 * 01..00 CHL[1..0] Character Length (00=8, 01=7)
3997 *
3998 */
3999 val = 0x00;
4000 if (info->params.data_bits != 8)
4001 val |= BIT0; /* 7 bits */
4002 if (info->params.stop_bits != 1)
4003 val |= BIT5;
4004 if (info->params.parity != ASYNC_PARITY_NONE)
4005 {
4006 val |= BIT2; /* Parity enable */
4007 if (info->params.parity == ASYNC_PARITY_ODD)
4008 val |= BIT3;
4009 else
4010 val |= BIT4;
4011 }
4012 write_reg(info, CHA + DAFO, val);
4013
4014 /* RFC Rx FIFO Control
4015 *
4016 * 07 Reserved, 0
4017 * 06 DPS, 1=parity bit not stored in data byte
4018 * 05 DXS, 0=all data stored in FIFO (including XON/XOFF)
4019 * 04 RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
4020 * 03..02 RFTH[1..0], rx threshold, 11=16 status + 16 data byte
4021 * 01 Reserved, 0
4022 * 00 TCDE Terminate Char Detect Enable, 0=disabled
4023 *
4024 * 0101 1100
4025 */
4026 write_reg(info, CHA + RFC, 0x5c);
4027
4028 /* RLCR Receive length check register
4029 *
4030 * Max frame length = (RL + 1) * 32
4031 */
4032 write_reg(info, CHA + RLCR, 0);
4033
4034 /* XBCH Transmit Byte Count High
4035 *
4036 * 07 DMA mode, 0 = interrupt driven
4037 * 06 NRM, 0=ABM (ignored)
4038 * 05 CAS Carrier Auto Start
4039 * 04 XC Transmit Continuously (ignored)
4040 * 03..00 XBC[10..8] Transmit byte count bits 10..8
4041 *
4042 * 0000 0000
4043 */
4044 val = 0x00;
4045 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4046 val |= BIT5;
4047 write_reg(info, CHA + XBCH, val);
4048 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4049 irq_enable(info, CHA, IRQ_CTS);
4050
4051 /* MODE:03 RAC Receiver Active, 1=active */
4052 set_reg_bits(info, CHA + MODE, BIT3);
4053 enable_auxclk(info);
4054 if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
4055 irq_enable(info, CHB, IRQ_CTS);
4056 /* PVR[3] 1=AUTO CTS active */
4057 set_reg_bits(info, CHA + PVR, BIT3);
4058 } else
4059 clear_reg_bits(info, CHA + PVR, BIT3);
4060 irq_enable(info, CHA,
4061 IRQ_RXEOM + IRQ_RXFIFO + IRQ_BREAK_ON + IRQ_RXTIME +
4062 IRQ_ALLSENT + IRQ_TXFIFO);
4063 issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
4064 wait_command_complete(info, CHA);
4065 read_reg16(info, CHA + ISR); /* clear pending IRQs */
4066 }
4067
4068 /* Set the HDLC idle mode for the transmitter.
4069 */
tx_set_idle(MGSLPC_INFO * info)4070 void tx_set_idle(MGSLPC_INFO *info)
4071 {
4072 /* Note: ESCC2 only supports flags and one idle modes */
4073 if (info->idle_mode == HDLC_TXIDLE_FLAGS)
4074 set_reg_bits(info, CHA + CCR1, BIT3);
4075 else
4076 clear_reg_bits(info, CHA + CCR1, BIT3);
4077 }
4078
4079 /* get state of the V24 status (input) signals.
4080 */
get_signals(MGSLPC_INFO * info)4081 void get_signals(MGSLPC_INFO *info)
4082 {
4083 unsigned char status = 0;
4084
4085 /* preserve DTR and RTS */
4086 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
4087
4088 if (read_reg(info, CHB + VSTR) & BIT7)
4089 info->serial_signals |= SerialSignal_DCD;
4090 if (read_reg(info, CHB + STAR) & BIT1)
4091 info->serial_signals |= SerialSignal_CTS;
4092
4093 status = read_reg(info, CHA + PVR);
4094 if (!(status & PVR_RI))
4095 info->serial_signals |= SerialSignal_RI;
4096 if (!(status & PVR_DSR))
4097 info->serial_signals |= SerialSignal_DSR;
4098 }
4099
4100 /* Set the state of DTR and RTS based on contents of
4101 * serial_signals member of device extension.
4102 */
set_signals(MGSLPC_INFO * info)4103 void set_signals(MGSLPC_INFO *info)
4104 {
4105 unsigned char val;
4106
4107 val = read_reg(info, CHA + MODE);
4108 if (info->params.mode == MGSL_MODE_ASYNC) {
4109 if (info->serial_signals & SerialSignal_RTS)
4110 val &= ~BIT6;
4111 else
4112 val |= BIT6;
4113 } else {
4114 if (info->serial_signals & SerialSignal_RTS)
4115 val |= BIT2;
4116 else
4117 val &= ~BIT2;
4118 }
4119 write_reg(info, CHA + MODE, val);
4120
4121 if (info->serial_signals & SerialSignal_DTR)
4122 clear_reg_bits(info, CHA + PVR, PVR_DTR);
4123 else
4124 set_reg_bits(info, CHA + PVR, PVR_DTR);
4125 }
4126
rx_reset_buffers(MGSLPC_INFO * info)4127 void rx_reset_buffers(MGSLPC_INFO *info)
4128 {
4129 RXBUF *buf;
4130 int i;
4131
4132 info->rx_put = 0;
4133 info->rx_get = 0;
4134 info->rx_frame_count = 0;
4135 for (i=0 ; i < info->rx_buf_count ; i++) {
4136 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
4137 buf->status = buf->count = 0;
4138 }
4139 }
4140
4141 /* Attempt to return a received HDLC frame
4142 * Only frames received without errors are returned.
4143 *
4144 * Returns 1 if frame returned, otherwise 0
4145 */
rx_get_frame(MGSLPC_INFO * info)4146 int rx_get_frame(MGSLPC_INFO *info)
4147 {
4148 unsigned short status;
4149 RXBUF *buf;
4150 unsigned int framesize = 0;
4151 unsigned long flags;
4152 struct tty_struct *tty = info->tty;
4153 int return_frame = 0;
4154
4155 if (info->rx_frame_count == 0)
4156 return 0;
4157
4158 buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
4159
4160 status = buf->status;
4161
4162 /* 07 VFR 1=valid frame
4163 * 06 RDO 1=data overrun
4164 * 05 CRC 1=OK, 0=error
4165 * 04 RAB 1=frame aborted
4166 */
4167 if ((status & 0xf0) != 0xA0) {
4168 if (!(status & BIT7) || (status & BIT4))
4169 info->icount.rxabort++;
4170 else if (status & BIT6)
4171 info->icount.rxover++;
4172 else if (!(status & BIT5)) {
4173 info->icount.rxcrc++;
4174 if (info->params.crc_type & HDLC_CRC_RETURN_EX)
4175 return_frame = 1;
4176 }
4177 framesize = 0;
4178 #ifdef CONFIG_SYNCLINK_SYNCPPP
4179 info->netstats.rx_errors++;
4180 info->netstats.rx_frame_errors++;
4181 #endif
4182 } else
4183 return_frame = 1;
4184
4185 if (return_frame)
4186 framesize = buf->count;
4187
4188 if (debug_level >= DEBUG_LEVEL_BH)
4189 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
4190 __FILE__,__LINE__,info->device_name,status,framesize);
4191
4192 if (debug_level >= DEBUG_LEVEL_DATA)
4193 trace_block(info, buf->data, framesize, 0);
4194
4195 if (framesize) {
4196 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
4197 framesize+1 > info->max_frame_size) ||
4198 framesize > info->max_frame_size)
4199 info->icount.rxlong++;
4200 else {
4201 if (status & BIT5)
4202 info->icount.rxok++;
4203
4204 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4205 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
4206 ++framesize;
4207 }
4208
4209 #ifdef CONFIG_SYNCLINK_SYNCPPP
4210 if (info->netcount) {
4211 /* pass frame to syncppp device */
4212 mgslpc_sppp_rx_done(info, buf->data, framesize);
4213 }
4214 else
4215 #endif
4216 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
4217 }
4218 }
4219
4220 spin_lock_irqsave(&info->lock,flags);
4221 buf->status = buf->count = 0;
4222 info->rx_frame_count--;
4223 info->rx_get++;
4224 if (info->rx_get >= info->rx_buf_count)
4225 info->rx_get = 0;
4226 spin_unlock_irqrestore(&info->lock,flags);
4227
4228 return 1;
4229 }
4230
register_test(MGSLPC_INFO * info)4231 BOOLEAN register_test(MGSLPC_INFO *info)
4232 {
4233 static unsigned char patterns[] =
4234 { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
4235 static unsigned int count = sizeof(patterns) / sizeof(patterns[0]);
4236 unsigned int i;
4237 BOOLEAN rc = TRUE;
4238 unsigned long flags;
4239
4240 spin_lock_irqsave(&info->lock,flags);
4241 reset_device(info);
4242
4243 for (i = 0; i < count; i++) {
4244 write_reg(info, XAD1, patterns[i]);
4245 write_reg(info, XAD2, patterns[(i + 1) % count]);
4246 if ((read_reg(info, XAD1) != patterns[i]) ||
4247 (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
4248 rc = FALSE;
4249 break;
4250 }
4251 }
4252
4253 spin_unlock_irqrestore(&info->lock,flags);
4254 return rc;
4255 }
4256
irq_test(MGSLPC_INFO * info)4257 BOOLEAN irq_test(MGSLPC_INFO *info)
4258 {
4259 unsigned long end_time;
4260 unsigned long flags;
4261
4262 spin_lock_irqsave(&info->lock,flags);
4263 reset_device(info);
4264
4265 info->testing_irq = TRUE;
4266 hdlc_mode(info);
4267
4268 info->irq_occurred = FALSE;
4269
4270 /* init hdlc mode */
4271
4272 irq_enable(info, CHA, IRQ_TIMER);
4273 write_reg(info, CHA + TIMR, 0); /* 512 cycles */
4274 issue_command(info, CHA, CMD_START_TIMER);
4275
4276 spin_unlock_irqrestore(&info->lock,flags);
4277
4278 end_time=100;
4279 while(end_time-- && !info->irq_occurred) {
4280 set_current_state(TASK_INTERRUPTIBLE);
4281 schedule_timeout(jiffies_from_ms(10));
4282 }
4283
4284 info->testing_irq = FALSE;
4285
4286 spin_lock_irqsave(&info->lock,flags);
4287 reset_device(info);
4288 spin_unlock_irqrestore(&info->lock,flags);
4289
4290 return info->irq_occurred ? TRUE : FALSE;
4291 }
4292
adapter_test(MGSLPC_INFO * info)4293 int adapter_test(MGSLPC_INFO *info)
4294 {
4295 if (!register_test(info)) {
4296 info->init_error = DiagStatus_AddressFailure;
4297 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
4298 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
4299 return -ENODEV;
4300 }
4301
4302 if (!irq_test(info)) {
4303 info->init_error = DiagStatus_IrqFailure;
4304 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
4305 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
4306 return -ENODEV;
4307 }
4308
4309 if (debug_level >= DEBUG_LEVEL_INFO)
4310 printk("%s(%d):device %s passed diagnostics\n",
4311 __FILE__,__LINE__,info->device_name);
4312 return 0;
4313 }
4314
trace_block(MGSLPC_INFO * info,const char * data,int count,int xmit)4315 void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
4316 {
4317 int i;
4318 int linecount;
4319 if (xmit)
4320 printk("%s tx data:\n",info->device_name);
4321 else
4322 printk("%s rx data:\n",info->device_name);
4323
4324 while(count) {
4325 if (count > 16)
4326 linecount = 16;
4327 else
4328 linecount = count;
4329
4330 for(i=0;i<linecount;i++)
4331 printk("%02X ",(unsigned char)data[i]);
4332 for(;i<17;i++)
4333 printk(" ");
4334 for(i=0;i<linecount;i++) {
4335 if (data[i]>=040 && data[i]<=0176)
4336 printk("%c",data[i]);
4337 else
4338 printk(".");
4339 }
4340 printk("\n");
4341
4342 data += linecount;
4343 count -= linecount;
4344 }
4345 }
4346
4347 /* HDLC frame time out
4348 * update stats and do tx completion processing
4349 */
tx_timeout(unsigned long context)4350 void tx_timeout(unsigned long context)
4351 {
4352 MGSLPC_INFO *info = (MGSLPC_INFO*)context;
4353 unsigned long flags;
4354
4355 if ( debug_level >= DEBUG_LEVEL_INFO )
4356 printk( "%s(%d):tx_timeout(%s)\n",
4357 __FILE__,__LINE__,info->device_name);
4358 if(info->tx_active &&
4359 info->params.mode == MGSL_MODE_HDLC) {
4360 info->icount.txtimeout++;
4361 }
4362 spin_lock_irqsave(&info->lock,flags);
4363 info->tx_active = 0;
4364 info->tx_count = info->tx_put = info->tx_get = 0;
4365
4366 spin_unlock_irqrestore(&info->lock,flags);
4367
4368 #ifdef CONFIG_SYNCLINK_SYNCPPP
4369 if (info->netcount)
4370 mgslpc_sppp_tx_done(info);
4371 else
4372 #endif
4373 bh_transmit(info);
4374 }
4375
4376 #ifdef CONFIG_SYNCLINK_SYNCPPP
4377 /* syncppp net device routines
4378 */
4379
mgslpc_sppp_init(MGSLPC_INFO * info)4380 void mgslpc_sppp_init(MGSLPC_INFO *info)
4381 {
4382 struct net_device *d;
4383
4384 sprintf(info->netname,"mgslp%d",info->line);
4385
4386 info->if_ptr = &info->pppdev;
4387 info->netdev = info->pppdev.dev = &info->netdevice;
4388
4389 sppp_attach(&info->pppdev);
4390
4391 d = info->netdev;
4392 strcpy(d->name,info->netname);
4393 d->base_addr = info->io_base;
4394 d->irq = info->irq_level;
4395 d->priv = info;
4396 d->init = NULL;
4397 d->open = mgslpc_sppp_open;
4398 d->stop = mgslpc_sppp_close;
4399 d->hard_start_xmit = mgslpc_sppp_tx;
4400 d->do_ioctl = mgslpc_sppp_ioctl;
4401 d->get_stats = mgslpc_net_stats;
4402 d->tx_timeout = mgslpc_sppp_tx_timeout;
4403 d->watchdog_timeo = 10*HZ;
4404
4405 #if LINUX_VERSION_CODE < VERSION(2,4,4)
4406 dev_init_buffers(d);
4407 #endif
4408
4409 if (register_netdev(d) == -1) {
4410 printk(KERN_WARNING "%s: register_netdev failed.\n", d->name);
4411 sppp_detach(info->netdev);
4412 return;
4413 }
4414
4415 if (debug_level >= DEBUG_LEVEL_INFO)
4416 printk("mgslpc_sppp_init()\n");
4417 }
4418
mgslpc_sppp_delete(MGSLPC_INFO * info)4419 void mgslpc_sppp_delete(MGSLPC_INFO *info)
4420 {
4421 if (debug_level >= DEBUG_LEVEL_INFO)
4422 printk("mgslpc_sppp_delete(%s)\n",info->netname);
4423 sppp_detach(info->netdev);
4424 unregister_netdev(info->netdev);
4425 }
4426
mgslpc_sppp_open(struct net_device * d)4427 int mgslpc_sppp_open(struct net_device *d)
4428 {
4429 MGSLPC_INFO *info = d->priv;
4430 int err, flags;
4431
4432 if (debug_level >= DEBUG_LEVEL_INFO)
4433 printk("mgslpc_sppp_open(%s)\n",info->netname);
4434
4435 spin_lock_irqsave(&info->netlock, flags);
4436 if (info->count != 0 || info->netcount != 0) {
4437 printk(KERN_WARNING "%s: sppp_open returning busy\n", info->netname);
4438 spin_unlock_irqrestore(&info->netlock, flags);
4439 return -EBUSY;
4440 }
4441 info->netcount=1;
4442 MOD_INC_USE_COUNT;
4443 spin_unlock_irqrestore(&info->netlock, flags);
4444
4445 /* claim resources and init adapter */
4446 if ((err = startup(info)) != 0)
4447 goto open_fail;
4448
4449 /* allow syncppp module to do open processing */
4450 if ((err = sppp_open(d)) != 0) {
4451 shutdown(info);
4452 goto open_fail;
4453 }
4454
4455 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
4456 mgslpc_program_hw(info);
4457
4458 d->trans_start = jiffies;
4459 netif_start_queue(d);
4460 return 0;
4461
4462 open_fail:
4463 spin_lock_irqsave(&info->netlock, flags);
4464 info->netcount=0;
4465 MOD_DEC_USE_COUNT;
4466 spin_unlock_irqrestore(&info->netlock, flags);
4467 return err;
4468 }
4469
mgslpc_sppp_tx_timeout(struct net_device * dev)4470 void mgslpc_sppp_tx_timeout(struct net_device *dev)
4471 {
4472 MGSLPC_INFO *info = dev->priv;
4473 int flags;
4474
4475 if (debug_level >= DEBUG_LEVEL_INFO)
4476 printk("mgslpc_sppp_tx_timeout(%s)\n",info->netname);
4477
4478 info->netstats.tx_errors++;
4479 info->netstats.tx_aborted_errors++;
4480
4481 spin_lock_irqsave(&info->lock,flags);
4482 tx_stop(info);
4483 spin_unlock_irqrestore(&info->lock,flags);
4484
4485 netif_wake_queue(dev);
4486 }
4487
mgslpc_sppp_tx(struct sk_buff * skb,struct net_device * dev)4488 int mgslpc_sppp_tx(struct sk_buff *skb, struct net_device *dev)
4489 {
4490 MGSLPC_INFO *info = dev->priv;
4491 unsigned long flags;
4492
4493 if (debug_level >= DEBUG_LEVEL_INFO)
4494 printk("mgslpc_sppp_tx(%s)\n",info->netname);
4495
4496 netif_stop_queue(dev);
4497
4498 info->tx_count = skb->len;
4499
4500 memcpy(info->tx_buf, skb->data, skb->len);
4501 info->tx_get = 0;
4502 info->tx_put = info->tx_count = skb->len;
4503
4504 info->netstats.tx_packets++;
4505 info->netstats.tx_bytes += skb->len;
4506 dev_kfree_skb(skb);
4507
4508 dev->trans_start = jiffies;
4509
4510 spin_lock_irqsave(&info->lock,flags);
4511 if (!info->tx_active)
4512 tx_start(info);
4513 spin_unlock_irqrestore(&info->lock,flags);
4514
4515 return 0;
4516 }
4517
mgslpc_sppp_close(struct net_device * d)4518 int mgslpc_sppp_close(struct net_device *d)
4519 {
4520 MGSLPC_INFO *info = d->priv;
4521 unsigned long flags;
4522
4523 if (debug_level >= DEBUG_LEVEL_INFO)
4524 printk("mgslpc_sppp_close(%s)\n",info->netname);
4525
4526 /* shutdown adapter and release resources */
4527 shutdown(info);
4528
4529 /* allow syncppp to do close processing */
4530 sppp_close(d);
4531 netif_stop_queue(d);
4532
4533 spin_lock_irqsave(&info->netlock, flags);
4534 info->netcount=0;
4535 MOD_DEC_USE_COUNT;
4536 spin_unlock_irqrestore(&info->netlock, flags);
4537 return 0;
4538 }
4539
mgslpc_sppp_rx_done(MGSLPC_INFO * info,char * buf,int size)4540 void mgslpc_sppp_rx_done(MGSLPC_INFO *info, char *buf, int size)
4541 {
4542 struct sk_buff *skb = dev_alloc_skb(size);
4543 if (debug_level >= DEBUG_LEVEL_INFO)
4544 printk("mgslpc_sppp_rx_done(%s)\n",info->netname);
4545 if (skb == NULL) {
4546 printk(KERN_NOTICE "%s: cant alloc skb, dropping packet\n",
4547 info->netname);
4548 info->netstats.rx_dropped++;
4549 return;
4550 }
4551
4552 memcpy(skb_put(skb, size),buf,size);
4553
4554 skb->protocol = htons(ETH_P_WAN_PPP);
4555 skb->dev = info->netdev;
4556 skb->mac.raw = skb->data;
4557 info->netstats.rx_packets++;
4558 info->netstats.rx_bytes += size;
4559 netif_rx(skb);
4560 info->netdev->trans_start = jiffies;
4561 }
4562
mgslpc_sppp_tx_done(MGSLPC_INFO * info)4563 void mgslpc_sppp_tx_done(MGSLPC_INFO *info)
4564 {
4565 if (netif_queue_stopped(info->netdev))
4566 netif_wake_queue(info->netdev);
4567 }
4568
mgslpc_net_stats(struct net_device * dev)4569 struct net_device_stats *mgslpc_net_stats(struct net_device *dev)
4570 {
4571 MGSLPC_INFO *info = dev->priv;
4572 if (debug_level >= DEBUG_LEVEL_INFO)
4573 printk("mgslpc_net_stats(%s)\n",info->netname);
4574 return &info->netstats;
4575 }
4576
mgslpc_sppp_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)4577 int mgslpc_sppp_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4578 {
4579 MGSLPC_INFO *info = (MGSLPC_INFO *)dev->priv;
4580 if (debug_level >= DEBUG_LEVEL_INFO)
4581 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
4582 info->netname, cmd );
4583 return sppp_do_ioctl(dev, ifr, cmd);
4584 }
4585
4586 #endif /* ifdef CONFIG_SYNCLINK_SYNCPPP */
4587